Leo valls is reknowned for creative powerslides and has an absolute plethora or variants. Here is a selection of some which are particularly dope!
One footpush back nose blunt (above)

Leo and his mates having a lark on some marble floor, lovely stuff:
http://youtu.be/4i8Eox95Vzw?t=7m44s

I like this one extracted from Magenta’s Hill Street Blues 2, back power to front crunt power, oof!
http://youtu.be/M5l_qwnxOjc?t=9m36s