Today in the lab I was trying to turn on a Bunsen burner. I turned on the wrong side of the gas tap and vented a big old stinky stream of natural gas in the laboratory. As if that wasn't stupid enough, I wanted to know immediately if the amount of gas I'd put in the air was dangerous, so I grabbed a sparker and sparked it around me. Nothing happened. Kind of disappointed, I proceeded to correctly light the Bunsen burner, right by where I'd vented the gas, and walk away. That was stupid too.