Raising your hips up off the seat a little while driving, so you can squeeze out a fart

That’s how I shit myself the last time.

Lest it travel untold, long-forgotten corridors.

Works even better on a bike.
Stand up on one pedal bending slightly forward, lifting your rear completely from the saddle while gently spreading the other leg outwards, then letting off a loud one echoing across the road - Glorious!