Just hold it 'til you get home...it's the only way for sanity's sake. 
Yeah, I wish they'd at least make the robot sinks and stuff a little more accurate. I don't like something else deciding when I'm done washing my hands or how many paper towels I need. I have big hands, damn people.
Also, have you ever used an automatic flushing toilet? You have not been mindfucked until that thing starts flushing halfway through some business.
~Zoo