It's a minor one, but drives me batty pretty consistently.
Why, oh why do people write the name of the intended recipient on a gift that's going to one person. I'm going to a shower tomorrow, and I'm bringing my gift as well as one from someone who's going to be out of town. She wrote the name on her card.
In case there's confusion as to who should be opening the present.
It's not like it's Christmas morning, with multiple people opening presents at the same time.
I'm so petty!