Well, it's a daily occurrence for me on the PC version and soon it will be for you also on the 360. I'm talking about all the fun little stuff you will experience ingame that never ceases to bring a smile to your face.
Some of my favorites:
1. teammates colliding in midair
I always chuckle seeing 2 allied planes shearing there wings off in a midair collision. Usually this occurs during a heated session of shoulder shooting

Sometimes you are lucky enough to see it when newbs are trying to fly in formation. Either way it never gets old~!
2. planes dropping bombs too low
Be it an idiot low level bombing in a B-17 or someone dive bombing a P-47 it's always a great joy to see the concussion blast from a 500lb bomb blowing the delivery boys plane to smithereens!
Any other PC vets feel free to add ?