"Arsenic Please" joke

A lady walks into the drug store and asks the druggist for some arsenic.

The druggist ask's "Ma'am, what do you want with arsenic?".

The lady say's "To kill my husband."

I can't sell you any for that reason" says the druggist.

The lady then reaches into her purse and pulls out a photo of a man and a women in a compromising position, the man is her husband and the lady is the druggist's wife, and shows it to the druggist.

He looks at the photo and says. . . . . . " Oh I didn't know you had a prescription!"