Google search terms: various combination (variations where needed) of "bladder", "massage", "forced", "urination", "micturition", "Credé", "maneuver" etc. (Looked everywhere I could think of in Wikipedia without finding much anything: I've been an editor and admin for 3 years)
Apparently, there's this thing called "Credé's maneuver" that's supposed to have some sort of effectiveness (how much is at best unclear from what I could find) on urination.
1. How effective is it against a mostly unsuspecting target?
2. Just how does one perform it?