It's rude to forget somebody gave you a gift
"Steve is at John's house and notices that John is still using the small rug Steve bought him years ago and says 'oh wow you still like that rug huh?""."
John wants to respond to Steve's statement about the rug.
John tells Steve that yeah he does love that rug and is so glad Steve gifted it to him years ago.
John tells Steve that yeah he does as he likes the style, but he cannot remember where he bought it.
Steve is delighted that his friend is getting such long use out of his gift and that he remembers he gave it to him.
Steve is annoyed that John doesn't even remember that Steve bought it for him and thinks he bought it himself.