Mercy Gas

You thought you were going to crap your pants...launch sequence initiated and you're at T-30 with the nearest bathroom at T-60...you know you're in trouble.

Then, you get a gift from heaven. You thought you were going to shit your pants, but you're given the gift form above...Mercy Gas. Just enough to buy you the time needed to defer the launch sequence until you can drop your drawers in the crapper.