This glitch will spawn a tactical insertion in mid-air. You can move around the tac a bit so its not very useful for online but its pretty cool. The video shows it on a little stair case but it works on all stairs so you could make it cooler by trying it on the high stair in the backyards or something.
TuT:
1. Go on a stair rail
2. Get prone
3. Crawl up and wrigglle left and right until it glitches when you try to turn
4. Spawn a tac
5. Die
6. Spawn
7. Float