Re: "Your Most Embaressing Game Mastering Moment"
I was in high school, and GMing RIFTs... (yeah, this is going to be a doozy)
So it was roughly sometime between 2 and 4 in the morning.
During a space battle, a giant mecha-style robot got blown up. One of its arms, about the size of a suit of power armor, was hurled by the force of the explosion direcly towards the player characters.
As an interlude, let me point out that by stats, the arm had a stupid amount of MDC (damage capacity, or BODY in Hero terms--Rifts doesn't have PD-style reduction of damage).
So the players start firing everything they've got at it, so as not to be hit by a disembodied arm going well over Mach-2.
So I roll damage, not really enough to vaporize the arm (the PCs had used up most of their heavy ordinance blowing up the robot in the first place, so they were using "small" arms fire).
The arm keeps coming.
So they fire some missiles at the thing.
I roll damage, still not enough, arm keeps coming.
Eventually, the arm slams into the majority of the PCs, scattering them like bowling pins. Session continues.
A little while later, someone points out to me that missiles are, y'know, explosive and should have at the very least knocked the arm off course.