As you are urinating into a toilet while standing, you decide that you also have to defecate. You then switch to sitting position to void your bowels.
On a side note: It is considered good form to "cut off" your urine stream before switching to the sitting position unless you can execute a toilet straddling position. It is also not recommended to attempt a two-point conversion if your starting position is at a urinal, unless you have a stall waiting.
I usually don't poo at bars, but those chili cheese fries made me go for a two point conversion.
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