C'est pas du vtt mais c'est marrant quand même:
https://www.youtube.com/watch?v=w8UGk6TP0Lg&feature=player_embedded
https://www.youtube.com/watch?v=-BesBEdNN0M&feature=relmfu
https://www.youtube.com/watch?v=w8UGk6TP0Lg&feature=player_embedded
https://www.youtube.com/watch?v=-BesBEdNN0M&feature=relmfu