The hardest thing you can do on a guitar..........

[DavidW]

http://www.youtube.com/watch?v=XVptre3Ixyk

 

[SumoNinja]

I'd say tap dance juggling

Impossible enough on firm ground let alone on a damn guitar without tripping all over

 

[MaddMaxx]

I'd say "prove" a conspiracy theory right... or wrong...

 

[lp85253]

i WOULD SAY ...to play it like RITCHIE BLACKMORE

 

[flowerpower]

That was kinda funny but if you can play and have enough patience, you can teach and make $.
Check how this chick plays...
http://www.youtube.com/watch?v=I5F59PkcDWM&feature=youtube_gdata_player