This isnt an exploit actually, but i saw the threads on how to do flips on ur mount and underwater, however this can be done in a much easier way ( i didnt actually check out what theese threads said ingame, but it sounds like the same thing that u can do with this command, however if it isnt the same thing and this is common knowledge as it should be, then a mod can just delete this thread or something ) :
U can get the same effect with this command : /console pitchlimit1-999 (pick a number)( i know i forgot the console part, my bad) . This determines how much u can pitch ur camera around, the default is 90, wich means u can turn ur camera angle 90 degrees up/down, with the pitchlimit set to 999 you can turn it around 999 degrees before it is stopped, thus turning ur camera completely around a couple of times. In water or in the air this can be used to direct ur char into a backflip movement, or just flying / swimming upside down etc... (can also be used to obtain a cool effect in movies)... U can also do some fun stuff with this, if u turn ur camera around some times while on a flying mount, and then press space, ur mount will do a couple of extremely fast backflips in order to get back to the default pitch, so if u tap space fast, ul do so many fast backflips so that the movement forms a circle, plus it looks ridicoulus( note that this worked before the Pitchlimit command was disabled, but i havent tried it out after it got re-enabled in 2.2, actually i havent tried the command out at all after it got re-enabled, but it was stated in the patch notes that it was )
Well hope it helped, i doubt this isnt known to a vast majority of ppl already, but i hope it helped some