The latest tattoo.

I was talking with two female art students here at the museum about tattoos. One said, “I want to get a bar code on the back of my neck.”
The other piped up with, “Don’t do that, a binary code is the latest thing.”
Knowing all tattoos become outdated I said, “I wouldn’t do either. My grandfather is still pissed off he got the Dewey Decimal System on his arm.”

They didn’t think it was funny.