that sounds very gay.
i do want to help you out with an idea but they have to have a sense of humor. This is what i just came up with:
Let your gf/wife/friend bake brownies.
Now get a standard cardboard box. Draw an asshole on it with a sharpie and cut an X in it. Put brownies in box.
Brother has to shove his arm in asshole to fish out brownies.
Edit: Just saw the weed brownies post, matches this perfectly
or it can be replaced with anything that resembles a turd, like a doorstop cut out of wood, etc.