Tear! I feel so out of the loop. Huge congratulations to you and your DH on your DD!
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Anyway, it has happened to me not once but 3 times!
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I even keep a potty in the car but DS prefers to pee standing and often prefers to poop standing too (will wait until pants are off but will not sit down on the potty).
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Once I managed to grab the potty and hold it behind him and caught most of it, once he had on flipped down ecapants which caught most of it, and the last time it got on the car, his legs, and the ground, so we cleaned him and the car up, then my DH moved the car. 
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