When I was at the beach with my friends, we decided to play a prank on the parents. We molded a Little Debbie fudge bar into the shape of a piece of feces, then placed it on the rim of the master bedroom toilet.

My friend's dad, thinking it was real and not wanting to create a scene, discretely flushed it down the toilet.

Aside from the fact that it was covered in fingerprints, it looked quite authentic...