You can do this with Alliance Druids, but with Tauren Druids its alot easier, considering Tauren Druids have much larger models. With Alliance Druids, it IS possible for people to find a way around you and fly where they want to go. Sorry, no pictures - but this makes it so that anyone that wants to fly from the opposite fraction cannot until you move, leaving them to either hearth (hope their hearth is set here!), run, cry on you so much you feel bad and leave, spend their time making a thread about it, or try their best to kill you.
This can be done in any cross fraction hold, but I have found it works best in: Eastern Plague Lands, Cenarion Hold.
1. Get a Winterfall Firewater pot. These can be found on the AH, or farmed from the Timbermaws in Felwood/Winterspring. Price check: 3g
2. Second, eat your Hallow's End Candy until you get the "Oranger; larger" buff. To get the Hallow's End Candy, go to Tarren Mill and do the quests there. Find the answers at www.thottbot.com .
3. Third, once in EPL or CC, PvP flag. If you're on a PvP server you will not have to do this, because you will already be flagged. (/pvp)
4. Go bear form. Use /sit to sit ontop of the flightpath master. Sit ontop of the OPPOSITE FRACTION'S flight point master. If you sit ontop of your own, you will get laughed at and called fat by your own teammates. And no one wants to get /mood at.
5. It will now be impossible to click on them. To fly from a flight master, they must 'right click' you, which will then attack you - sending guards after them.
Very nice stress relief! Have fun, and grief many.