A boy is sitting in a dentist chair getting braces, and a dentist comes in and says, "Brace yourself!"
Brace Yourself
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Explanation
Explain Bear
Listen up, you chucklehead. The "dentist" is telling the boy to "brace" himself 'cause he's about to put braces on him. "Brace yourself" also means to prepare for something difficult. It's called a freakin' pun. Do you even know what a pun is?