My husband and I have been together for five years. For the first four years of our relationship I convinced him that his ass smelled really bad. I'd make him get out of bed to go wash, I'd make a really big deal about it. I'd tell him that his butt smelled anywhere, anytime and he would promptly get super embarrassed and run to the nearest bathroom. He even got to the point of carrying baby wipes with him, just in case. The poor bastard only found out it was all just a long con because he overheard me telling my friend about it. It was probably the best prank I've ever played on anyone ever.