Here's a force presentation that came to me by watching F. U. C. (by Nefesh & Harrismatic).

Have an assistant covered in a cloak on stage. For the preceding tricks she stays cloaked. Then, when a spectator comes on stage, have him "choose" (i.e. force) a card between different pictures of women, not famous women, but women your assistant could technically be (photos could be those of your friends, etc.). The forced picture is that of your assistant. Then reveal your assistant, who takes a bow.

Could even be more fun if multiple assistants are on stage (just force multiple cards).

Great idea.
Which force would you recommend, and in general how would you avoid the audience backtracking and conclude that it had to be a force?