Yankee Swap gift Ideas for a karate party? Help please?

Yankee Swap gift Ideas for a karate party? Help please?
So, at the place where I take karate, me and the other assistant teachers are having a yankee gift swap at the Christmas party. We were told to get one joke gift and one serious gift, but I'm having trouble thinking of either. I was thinking for a joke gift, Black Belt Sudoku, but other ideas would be nice. Thanks.

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