Never happened to me..
But it occasionaly goes sideways, which is a pain when its all over the furnace. And then you forget to clean it - so it evaporates. Evaporating pee is not a good smell...
Okay; how about this;
You woke up, and are taking a shower. You havent had your morning piss. Your sitting their, cleaning, and you gotta pee. Do you go in the tub- and just not care, or step out and get the floor wet?