A mad scientist is an easy costume to put together, especially in a pinch. First, find or buy a lab coat. See if it can be borrowed from a friend or relative, but if not, buy from a thrift store. Probably only a few dollars, a lab coat is an inexpensive purchase, probably the only thing you'll need for the costume. Also, assemble a beaker or some other container that looks like it might be used in a lab.
Secondly, wear a pair of wrinkled khakis, some old sneakers, and a wrinkled button up shirt. Put on some old preferably broken glasses and make sure your hair is messy. Put some gel in
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