Sure, we've all seen the toothless OU fans do horns down before. Guess what?
OU DOWN:
1) put an "O" with your arms over your head
2) bring your arms forward until they are down in front of your belt, as though you were cradling a massive baby. This is your "O Down"
3) Open up your arms making your "U Down"
4) Repeat as necessary
5) You are welcome