That isn't funny or cool. Just incredibly mean considering not only does it ruin the book bit unless someone finds it fast it'll get moldy and ruin more books. I'd probably stop talking to my friends if they did stuff like that.
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But I've known this boi since 4th grade, he always does stupid shit...This one is the stupidest by far, I laughed when he did it but only because I knew how much shit he would get into, lel