My two girls are married and raising their own kids. Each has a daughter. I got each of the son in laws a black t-shirt with the following emblazoned across the front
"Guns don't kill people. Dads with pretty daughters do!"
Each of them has it neatly folded in a drawer waiting for the daughters first date to come to the door.
Hope I live long enough to see it.
I had to manhandle one young man who was pursueing one of the girls. It resulted in me having an interview with a cop (lady cop) who told me "well, I understand, but try not to do it again".
Made me my wife's hero for at least a week. :D