most simple solution is to alias :q like so:
alias :q=`echo ”This is not vim”`

but as someone suggested in commandlinefu, you can use tput to put some color and fun into this.
alias :q=’tput setaf 1; echo >&2 ”this is NOT vi(m) :/”; tput sgr0’

Related Articles:

• 2009/11/19   Multiple search in vim
• 2009/12/18   Display a block of text with delineated by a start pattern and an end pattern
• 2009/12/07   View the newest xkcd comic.
• 2009/12/05   Insert a comment on command line for reminder
• 2009/11/16   bash colors