From I dream of Jeannie during its final season - Dr. Bellows to Major Nelson: 

He never did find out, did he?

Joey: I'm immune to chicken pox.
Jesse: You can't be immune to chicken pox, huh?
Joey:
Every kid in my school had 'em but me. I guess when you're an awesome
physical specimen like my own bad self, germs take one look at my body
and say, "Hey! Why waste our time?"
Jesse: Women say the same thing.
Joey: That's right.

Danny: Good morning, Joey.
Joey: (groaning) Oh... I got a fever. I'm sweaty; I'm chilly; obviously it's malaria. Look at all these mosquito bites!
Danny: Those aren't mosquito bites - those are chicken pox!
Joey: That's impossible - I'm immune!
Jesse: You're immune to common sense.

From the Full House episode "A Pox in Our House."

http://youtu.be/vnzcLoxIXHI

^ Al Bundy for president!

Darrin: My wife is a witch.

Bartender: Cheer up. You should see MY wife.

Bewitched