Re: the 1st one... disabling a tip over switch has its negative effects, but looks cool in the video. Regardless, cool wheelie. I couldn't do that.
#11 is a really bad example - the bike seemingly stalls during a race start, and the rider is hit/dragged by another bike really badly. Not sure about injuries, but wouldn't be surprised if the rider died. This example of "fails" (not only in this gallery, but also as it relates to similar TV shows and alike) brings up in me a good deal of anger, and here is why...
It is one thing to laugh at someone doing something really stupid and failing as a result. It is quite different when the "fail" is someone else's tragedy. Just doesn't feel right to laugh.