I also once did a glitch on Spec Ops: The Line, where on how you have limited ammo but want to get more ammo without having to wait till you find more ammo packs, and you love a certain weapon such as the Scout Tactical Sniper Rifle (My fav sniper in the game :3) but want to have more than one of same gun you like... you can dupe weapons in Spec Ops, just like how you can dupe items in Terraria 1.2 and 1.3. It takes time to do, so watching a video of this particular glitch is recommended.
This one time in CoD World at War I got stuck mid jump inbetween a mound of dirt and a metal cross beam barrier thing during Co-op with my brother.
I couldn't walk or jump, but I could shoot and throw grenades, so I shot important people to fail the mission and respawn at last checkpoint.
GUESS WHERE THE LAST CHECKPOINT WAS?
RIGHT WHERE I WAS STUCK!
So I gunned down my brother and held a grenade without a pin
AND RESPAWNED STUCK AGAIN