Thought about posting this, didn't see any other threads about it, since this is just added today.
Also some people might not know this. So yeah.
1. Get to darkmoon faire.
2. Buy a ticket for the carousel. (This can be done from the vendor standing right next to the carousel.
3. Get on the carousel and click on one of the vehicles.
4. Stay there until you have 1 hour of 10% increased exp and reputation.
5. Profit.
BTW: You can't miss the carousel when running through the darkmoon faire isle.
You can get the 1 hour buff 24/7 as long as DMF is up.