Same thing has happened to me. I remember when i was younger i blamed my mom. I accused her of hitting me in my sleep. Because i had woken up that morning with a busted lip. It was swollen and had a cut there too. She denied it and said i probably bit myself in my sleep. But i still don't believe her to this day. She had a smile on her face while denying it.

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Excuse me while I light my spliff, Good God I gotta take a Lift