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A guy who won't stop bugging you for something, but when he gets it, he's too busy taking a dump to even notice you're there.
He kept asking me for my lunch money for weeks. When I gave it to him, he went to the bathroom and forgot about me.
She kept begging me to let her copy my homework. When I said yes, she ran off and didn't even thank me.
He kept yelling at me for my bad grade. When I got it fixed, he just walked away like I was invisible.