Good ideas for some funny ''weapons''?

well im going to south carolina on vacation with my friend this summer and she has and older brother (16) and he thinks hes all cool and tough cuz he always jokes on me and listens to rap music but anyways..last time i would always get pushed around by them and they would jokingly laugh at me so i was thinking this time for fun i could bring some defense...so far all i can think of is a mini fire extinguisher and an airsoft gun? what else can you think of