When you're desperate for a poo, your toilet radar makes your need to go more and more urgent the closer you get to a toilet. The moment you close the cubicle door and start to pull your pants down, your toilet radar goes into overdrive and there's no going back!
Your toilet radar also has a 'roaming' mode for when you go to a country where you are fearful of the sanitary standards of the bathrooms. With no acceptable toilet nearby, your toilet radar suppresses the need to relieve yourself for days at a time.
Relieved Man 1: "Phew, that was a close one, my toilet radar went mad just as I got into the cubicle - it was a close shave as the radar nearly didn't account for the trouble I was going to have unbuttoning my jeans!"
Friend: "Too much information, man."