P.M.C.S.
P. M. C. S. is the thing that makes soldiers swear more than they do during a deployment.
The tank had to do P. M. C. S. and the toilet wouldn’t flush again.
They did P. M. C. S. on the truck and found out the engine was just pretending.
The jet passed P. M. C. S. but the pilot had to eat a sandwich for the radio.