When I was younger, five of us shared one bathroom. My sister and brother were famous for spending large amounts of time in there at any given time.
I had to pee. I was beyond the pee pee dance, I was seeing and tasting yellow, and I recall my young little life flashing before my eyes....
My mom scooped me up and made me pee in the kitchen sink. I was mortified, yet, thankfully relieved. I was reminded at the time not to get used to it, because the kitchen sink was not meant to be an optional toilet. I guess she got a little nervous when I asked if I could poop there too. (and, no, I didn't).