I dropped a sofa on my hand (while looking under it for something)
Maybe the dumbest was when I was play fighting with my husband...
He was bent with his palm on the countertop and elbow in the air. I thought It'd be smart to jump on his back. So I did just that, headbutted his elbow and spent the rest of the night with frozen peas on my eye. I laid the guilt on though; even though it was 100% my fault! It was hard to tell people that the black eye came from my husband; I don't know how many people believed the story.