In my opinion, the most annoying thing that can happen to you. Youre racing round, about 4th-5th place and the guy in front drops mines say, while you activate a forcewall. You bam into the guy in front, everyone else comes whacking into the back of you, hitting the force wall, pushing you into the mines, its chaos. You get moving again and youve gone from 4th to 10th. Annoying?