Perhaps you are struggling with what you’re going to do for the company costume contest. If only you could incorporate your regular commuting gear… Lifehacker has the answer, your normal bike wear makes up the majority of the costume. A little latex, gravel and other goo and you’re set to freak out your co-workers. Check out the Brutal Bike Wreck at Lifehacker — now, where did I put that bag of fish tank gravel?…