Ozzy Osbourne is playing the Sprint Center, and my mom asked “is he going to bite the head off a bat?” I told her I didn’t think he did that anymore. “Maybe he’ll bite the top off a bottle of Geritol, instead,” she said.
Yes, it was funny, but I felt that Geritol was a pretty outdated reference. So, I asked “what century are you in?” At that moment, I realized that “what century are you in?” could include a relatively recent period of time.
“What century are you in?” doesn’t really work as a slam until you’re in the later part of the century. Therefore, it’s dead to me. If only we’d known earlier, we would’ve been sure to use it more when we could. We were simply too distracted with Y2K.