Yes or No.... Would it be mean if I happen to have sent 5 friends of mine "Happy Father's Day" cards written in crayon from a strange address....just to make them shit and wonder where/when/how....how old?

I think this is hilarious, not mean at all. If any of your friends don't laugh about this, they're probably actually worried about something like this coming out lol.

We each pull a prank on each other once every year.....randomly.  This will be mine for the year.....