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Platypus pretended to trip because when you tried to switch the shoes, you didn't realize that he didn't wear shoes! You mistook @AltonicKeys for Platypus!! He fell over, not Platypus. You also broke your foot kicking the bowling ball and so weren't able to move fast enough to claim the sandwich from where Platypus dropped it, because he was startled. Platypus takes it back off the ground.