1/ ride no handed for more than 10 seconds?
Probably not. I used to be able to though
(when I was about 13)2/ pull a wheelie getting the front wheel more than 6 inches off the ground?
On my MTB, yes.
3/ pull a wheelie and keep it up for at least 20 yds?
No4/ hop both wheels off the ground at once?
Dunno, never tried.
5/ do a proper bunny-hop: pull a wheelie then push down on the bars to bring the back up (i.e. hop with out the use of clipless pedals)?
No6/ track stand for more than 6 seconds?
No7/ while riding along, reach down and pick a tennis ball up off the floor?
Dunno, never tried.8/ bike surf (i.e. one foot on the centre of the handle bars, the other on the saddle, both hands off the bike)?
NO!9/ endo (i.e. hit the front brake to lift the rear wheel more than 6 inches off the ground)?
Probably.
10/ endo-turn (as above but turn the bars so that you land with the bike pointing more than 90 degrees from the original direction)?
Might just have a go 11/ take off or put on a rain jacket while riding along?
Dunno, never tried.
Bonus points:
12/ skid stop on a fixed.
No.
13/ ride out the saddle on a tandem.
Yes14/ ride a unicycle?
NoSo only 1 clear point plus 1 bonus point
Must try harder...