One of the first spartan levels, the one that starts on the bridge. Go to the end of the bridge and go past the toll part, and then 2 wraiths and some 'shees show up. Kill the wraiths (or just ignore them) and hijack a 'shee. The designers didnt want u to take a 'shee to the next part, so theres this invisible forcefield starting a little in front of the toll part. Since you're so far into the forcefield, you get flung a good distance back while in the 'shee. It's fun.