Not my girlfriend, just a roommate.
So fellas, gimme some ideas for epic pranks that keep her on her toes all the time.
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Impregnate her while she's sleeping. When she wakes up the day after punch yourself in the face and go up to her with a bruise and say that a guy came in and knocked you out after getting in a fist fight. Say that because of the noise the robber left. She will never suspect a thing.