Here's one you've most likely seen before, but it's still funny:
Last night I was in a Dustbowl server (second section) with 4 other
Spies. You can guess how far our team got. It was absurd, I
literally killed two snipers, went to the enemy base sapped the
entrance teleporter, killed another Sniper and a Soldier, went back
to the combat sapped a Sentry and we still hadn't moved an inch
from where I left the team. You can be Spy,
if you do
something. It was absolutely absurd.