Shit vs Wee Wee

My sister once told me that humans are not able to shit and wee wee at the same time. You can only pee or shit. Both functions do not co-exist. Don't ask me how we got to that topic cos I don't remember. Anyway, just realised that it is not true! When you are in super urgent need to wee wee and super urgent need to shit, you can do both simultaneously! Tried and tested... personally! muahaha