They were in a dungeon. One of the players (P1) went ahead and found a hasty barrier constructed by kobolds. Knowing kobolds were tricksy things and probably had trapped the obvious way in, she calls out to the little lizards. A couple of exceedingly fortunate diplomacy and bluff checks later, and I had the kobolds confirm the location of the trap for her. With the knowledge she needed, she stood in place while the rest of the party sorted something else out. Of course, they screwed up and yelled at her that they needed to move. Not more than 5 minutes had passed since the trap discussion.
P1 - Ok, I move to here. *illustrates course through the trapped square*
GM - Um
P2 - Um
GM - Are you... Okay then.
Every else at the table is struggling to keep their poker face up. She insists she's doing it. The GM moves her pawn until they got to the trapped square, and then yells "BOOM"!
Of course, the actual quote that set everyone laughing is what she said next. It's also not postable to this forum due to censorship issues.