I know we've all made such a mistake at one time or another.
My incident was in a shock-themed danger room (the one with the 8 loop, spikes, and blast cube lines blocking two paths.)
I opened up a blast cube line only to have a Trojan fly through the opening and trample me to two pips health and my teammate to death.
I run away and then a teamie's charlibur attack sends a Zombie flying in my general direction and I get a nice faceful of zombie fistpunch. I die, then I see the same Trojan that killed my teammate squash Mr. Charlie like a bug.
So what's yours?
I had to go get the door while Vanaduke was in his 2nd mask phase.
Yeah.