Without trying to be religion specific post here the worst situation you have had with giving gifts. This could be for the holidays, birthdays, anniversaries etc.. And be honest. Spread some real live stories about the retailer from hell or that "special" person who wasn't very appreciative.
Well, I had a classmate that has a terrible breath. I gave him a toothbrush and a bottle of mouthwash in our exchange gift and I this he was insulted with the gift.