What excuse can i use to not go swimming?

I agree with erin. However, since you don't want that answer tell them your mother is the witch from the wizard of oz(it was a movie from back in the day.. the witch melted when she was hit with water)... Or tell em your allergic to chlorine and it makes you break out. But i like the period excuse i use it all the time.. dunno why they believe it since im a guy... people are dumb.