These are good, but get samey pretty fast:
- Where is X?
Comes back immediately with X.
I’d like to see one involving changing clothes in a clothing store, or maybe eating a meal in a restaurant super quick, or walking a dog that changes into a different dog as soon as the guy walks behind a tree, or…
ETA: Of course, that last one doesn’t need twins. D’oh! Just leave dog two hidden behind the tree and swap leads as you walk by.