Street car tracks. I been dumped badly once when my front wheel feel into one and deflected the whole front out from under me. Sucked hard!
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"No drug, not even alcohol, causes the fundamental ills of society. If we're looking for the source of our troubles, we shouldn't test people for drugs. We should test them for stupidity, ignorance, greed, and love of power." -P.J. O'Rourke