"React" to what the previous person gifted you then gift the next person something. You don't have to pick something you think they will like, it can be odd stuff like really specific and niche things or even something a cat might leave in your shoe.
I'll start! Next person, I'm giving you my old Pokemon cards, but not the really good ones.

I'll start! Next person, I'm giving you my old Pokemon cards, but not the really good ones.