What's a good reason for breaking your hand when you can't tell your boss you broke it because you punched a wall blacked out?

When I was drunk last night I punched a wall and broke my hand. I now have a full cast on for at least 4 weeks. I cannot go into work and tell my bosses/coworkers i punched a wall because I was blacked out. What is a good reason I can use as to why I broke my hand?
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