Hit the left wall in the tunnel in Germany to uncover a picture 
of a girl. Quick way to get in front of the pack:

Select a track with four lanes. When "Go" appears, steer to the 
two lanes that are open. Press A, A to do a couple wheelies and 
speed up. When you get to the first turn you should at least be 
in fourth place. If you have not hit anything, you could be in 
first place.