How about a long lost 'friend" that you haven't talked to in years, suddenly shows up on your door with a pin he overpaid for at an auction and just decided you could go through it for him and fix it because the auctioneer said it only needed a fuse. After a little back and forth when you tell him what your time is worth, he is utterly pissed off because you had the audacity to charge him when you are such great buddies.

If I hear the phrase, " I thought I would bring it by and LET you tinker with it" one more time, I will puke.