if you go underwater then hold the up arrow (or down arrow) + the insert key and hold it youll do backflips
to do a frontflip "thanks to ganusch" hold up arrow (or down arrow) + delete
edit: uh-oh a gm found me doing this cause i accedentlly went all the way through the ground of the water and stayed there by holding down + delet to get there then holding inster once iw as down so he teleported me to my main town and disconected me from server... i hope they dont fix this i think they should leave it :P