Write your question (or answer) on the back of puzzle that they have to put together . . . + other ideas!
Someone should borrow their friend who they wanna ask to proms phone and then change their name to will you go to prom with me? :) then call them... Then if they answer it then its a yes and if they don't then its a no... hahaha cute lol wait is that what they did??? Idk but cute