The funniest/most idiotic thing your players have done
I think the subject says it all. Here's mine:
My players are ordered to the Maelstrom to search for a lost Akira. They find the U.S.S.Mateo drifting in space with no life signs. They beam aboard, find everyone dead and beam one corpse off for analysis. Once they discover it was foul play they immediately began searching for the culprit.
Here's the funny/idiot part, they checked the crew manifest and saw that one person's combadge was missing from the ship (the one they beamed off). They spent the next hour and a half trying to figure out a plausible reason why that particular crewmen did it. They had a nice complete story when one of them hailed their ship and the CMO told them that the autopsy was complete on the body of the unamed crewmen which they believed had done the deed.
At that moment I burst out laughing, I just couldn't believe they had completely forgotten about the guy they beamed off. Hilarious from my side, they felt pretty stupid and rightfully so.;)