Usually its something like "hoow shit its the.. ow wait its the credits already"
Just a few games really made something epic.
Playing Serious Sam: the first encounter on local multiplayer (hardest difficulty +400% +200% per player x 8 players).
"Uh.. wait wasnt this the part where the bo.... Holy fucking shit!" (boss + hordes of enemy's multiplied by the added difficulty spawned)
darn thing took about 45 minutes to die. but damn it was fun

(that was about 9 hours of continues play from start to finish).
I still hate bulletstorm for not having a good boss fight at the end. The plant in the middle was cool though.