you've never seen that before? this has been done for quite some time now. pretty cool at first but seeing it all the time in bike stunts, it gets old.
If you think bike-surfing is cool, then you got to look at moped surfing: http://www.youtube.com/watch?v=TIIJOC9G53Q ...you gotta watch at least half of it, just so you know what they hell you are looking at...it's just weird
...it's even funnier when you watch it drunk and with the volume turned up (I think they are speaking Turkish, but still funny).