Eye the lad up and down with my steely mother's eye, whisper in my daughter's ear, eye the lad again, giggle softly, look at my husband and say "he'll do", snap a pic of the sweet young couple and leave the room. Hopefully the poor guy will be unnerved enough to be a gentleman.
Either that or let him know I'll be up waiting, in case the date doesn't go as he hopes.
Can't decide which would creep him out more...
Or wait, what about realizing we'd raised a strong, intelligent young woman who chooses her friends well and values herself?