I'll do it sitting on my chair too if I'm there at the time, won't bother standing up only to pee.
I know, peeing schoolgirl is so cliche, but there was something so very exciting about trying to not pee myself at my desk.
I will get somewhere a minimum private to do it; sometimes I'll even go to the toilet but not remove any clothes and go on the floor rather than the toilet if I can.
And you just sit there and pee in your pants like a two year old? It was embarrassing and i havent wet my pants since! When some good dancing music came on I got up and danced.