Caption for the blind: sometimes when you put your trousers down to pee, a they fold in such a way that there is a large crease blocking the line between your dick and the toilet. Unsuspecting of this you start to pee (this crease is not a regular occurrence), and only end up finding out when it’s too late.
OP is the type of guy to put his penis back in his pants when the stream just starts to die down
There’s no time! Just let it drip out the pant leg.