How do you respond to "forgot your name?"

How do you respond to "forgot your name?" Generally, because if you're like me and you get that question maybe 1 in every 3 times you go to order food or meet people, I think it's important to recognize that it typically doesn't come from a place of ill-will. I usually just say, "no, I stutter," with a straight face and hope I don't come across as vindictive. What about you?