On Immunity Puns

Because they have tiny antibodies!

I dropped this joke on an unsuspecting lecture hall after an hour's worth of lecture about immune assays. The lecturer even repeated the joke and the punchline into her mic so the whole thing is recorded. I've never heard so many people groan in unison, about 150.

So I was getting ready to take a trip to Africa and needed some immunizations before leaving. My dad and I get to the city health center, a two story building, and ask the security person how to get to the office we're looking for. We chat about the trip and all that, and she points us to the elevator. We get on, and she calls out "have a great trip!" As the doors are closing my dad says back

"What? We're just going to the second floor!" Thanks dad.