A better question might be what's the stupidest thing you've ever heard of, that way you can have plausible deniability.
I know a guy who tried to tear down his own house, barehanded. The next morning he claimed he didn't have a hangover and didn't remember a thing. The cuts on his hands made him a believer.
Unfortunately, now you all think this was me. I wish.
I was the one helping.