diff --git a/etc/profile.d/help50.sh b/etc/profile.d/help50.sh
index f33f7c6..490e09f 100644
--- a/etc/profile.d/help50.sh
+++ b/etc/profile.d/help50.sh
@@ -10,15 +10,19 @@ HELPERS="/opt/cs50/lib/help50"
 . /opt/cs50/lib/cli
 
 # Disable yes, lest users type it at prompt
-if command -v yes &> /dev/null; then
-    function yes() {
-        if [[ -t 0 ]]; then
-            :
-        else
-            command yes
-        fi
-    }
-fi
+function yes() {
+    if [[ -t 0 ]]; then
+        _alert "That was a rhetorical question. :)"
+    else
+        command yes
+    fi
+}
+alias y=yes
+
+# Don't override `n`, though
+function no() {
+    _alert "That was a rhetorical question. :)"
+}
 
 # Ignore duplicates (but not commands that begin with spaces)
 export HISTCONTROL="ignoredups"
@@ -98,7 +102,7 @@ function _help50() {
 if ! type _helpful >/dev/null 2>&1; then
     function _helpful() {
         local output=$(_ansi "$1")
-        echo -e "\033[33m${output}\033[39m" # Yellow
+        _alert "$output"
     }
 fi
 if ! type _helpless >/dev/null 2>&1; then
diff --git a/opt/cs50/bin/help50 b/opt/cs50/bin/help50
index 7e46f6d..1120587 100755
--- a/opt/cs50/bin/help50
+++ b/opt/cs50/bin/help50
@@ -57,6 +57,13 @@ function _start() {
 }
 
 function _stop() {
+
+    # If not helping
+    if [[ -z "$HELP50" ]]; then
+        return 0
+    fi
+
+    # Kill grandparent process (i.e., `script` itself)
     local ppid=$(ps -o ppid= -p $$) # bash --login
     local gppid=$(ps -o ppid= -p $ppid) # sh -c
     local ggppid=$(ps -o ppid= -p $gppid) # script
diff --git a/opt/cs50/lib/cli b/opt/cs50/lib/cli
index 9c1384d..0ea76be 100644
--- a/opt/cs50/lib/cli
+++ b/opt/cs50/lib/cli
@@ -1,3 +1,7 @@
+function _alert() {
+    echo -e "\033[33m${1}\033[39m" # Yellow
+}
+
 function _ansi() {
 
     # If command-line arguments
@@ -10,8 +14,8 @@ function _ansi() {
     fi
 
     # Format backticks as bold
-    bold=$(printf '\033[1m')
-    normal=$(printf '\033[22m')
+    local bold=$(printf '\033[1m')
+    local normal=$(printf '\033[22m')
     echo "$input" | sed "s/\`\\([^\`]*\\)\`/${bold}\\1${normal}/g"
 }
 
@@ -22,31 +26,11 @@ function _search() {
         return
     fi
 
-    # Find any $1 in descendants
-    paths=$(find $(pwd) -name "$1" 2> /dev/null)
-    if [[ -z "$paths" ]]; then
-
-        # Find any $1 in ancestors
-        local dir="$(dirname "$(pwd)")"
-        while [[ "$dir" != "/" ]]; do
-            paths=$(find "$dir" -maxdepth 1 -name "$1")
-            if [[ -z "$paths" ]]; then
-                dir=$(dirname "$dir")
-            else
-                break
-            fi
-        done
-        if [[ -z "$paths" ]]; then
-
-            # Find any $1 relative to `cd`
-            pushd "$(cd && pwd)" > /dev/null
-            paths=$(find $(pwd) -name "$1" 2> /dev/null)
-            popd > /dev/null
-        fi
-    fi
+    # Find any $1 in descendants of $WORKDIR
+    paths=$(find "$WORKDIR" -name "$1" -printf "%T+ %p\n" | sort -nr | awk '{print $2}' 2> /dev/null)
 
     # Count paths
-    count=$(echo "$paths" | grep -c .)
+    local count=$(echo "$paths" | grep -c .)
 
     # If just one
     if [[ "$count" -eq 1 ]]; then
@@ -60,7 +44,7 @@ function _sure() {
     if [[ $# -ne 1 ]]; then
         return 1
     fi
-    prompt=$(echo "$1" | _ansi)
+    local prompt=$(echo "$1" | _ansi)
     while true; do
         read -p "$prompt [y/N] " -r
         if [[ "${REPLY,,}" =~ ^(y|yes)$ ]]; then
diff --git a/opt/cs50/lib/help50/bash b/opt/cs50/lib/help50/bash
index 556b6e3..e0be583 100755
--- a/opt/cs50/lib/help50/bash
+++ b/opt/cs50/lib/help50/bash
@@ -2,6 +2,7 @@
 
 output=$(cat)
 
+# touch foo.py && foo.py
 regex="bash: (.*\.py): command not found"
 if [[ "$output" =~ $regex ]]; then
 
@@ -12,12 +13,14 @@ if [[ "$output" =~ $regex ]]; then
     fi
 fi
 
+# mkdir foo && ./foo
 regex="bash: \./([^:]*): Is a directory"
 if [[ "$output" =~ $regex ]]; then
-    echo "Cannot execute a directory. Did you mean to \`cd\` into \`${BASH_REMATCH[1]}\` instead?"
+    echo "Cannot execute a directory. Did you mean to run \`cd ${BASH_REMATCH[1]}\`?"
     exit
 fi
 
+# touch foo.c && ./foo.c
 regex="bash: \./(([^:]*)\.c): Permission denied"
 if [[ "$output" =~ $regex ]]; then
 
@@ -28,7 +31,7 @@ if [[ "$output" =~ $regex ]]; then
     fi
 fi
 
-regex="bash: (\./.*\.py): Permission denied"
+regex="bash: \./(.*\.py): Permission denied"
 if [[ "$output" =~ $regex ]]; then
 
     # If file exists
@@ -38,6 +41,7 @@ if [[ "$output" =~ $regex ]]; then
     fi
 fi
 
+# touch foo && /.foo
 regex="bash: /\.([^:]*): No such file or directory"
 if [[ "$output" =~ $regex ]]; then
 
diff --git a/opt/cs50/lib/help50/cd b/opt/cs50/lib/help50/cd
index a9bf588..c451e02 100755
--- a/opt/cs50/lib/help50/cd
+++ b/opt/cs50/lib/help50/cd
@@ -1 +1,20 @@
 #!/bin/bash
+
+. /opt/cs50/lib/cli
+
+output=$(cat)
+
+# mkdir -p foo/bar && cd bar
+regex="cd: (.*): No such file or directory"
+if [[ "$output" =~ $regex ]]; then
+
+    # Search recursively for directory
+    dir="${BASH_REMATCH[1]}"
+    parent=$(_search "$dir")
+    echo -n "There isn't a directory called \`$dir\` in your current directory."
+    if [[ ! -z "$parent" ]]; then
+        echo " Did you mean to \`cd $parent\` first?"
+    else
+        echo
+    fi
+fi