One of the cardinal rules about mocking someone is that you yourself should not do worse than the person you are mocking in your attempts to mock them. CNN’s Don Lemon, in all his brilliance, apparently didn’t realize that last night when he took the airwaves.

In what I’m sure he thought was going to be an absolutely killer segment owning the orange man, he decided to take a cognitive test on air. This was an attempt to make fun of Trump for talking about the cognitive test he had recently taken. That discussion happened during a Fox News interview.

The problem? Lemon screwed up the cognitive test on live TV.

Can I get an injection of this straight into my veins?

If you can’t watch the video, Lemon confuses a rhino for an hippo, something your average five year old wouldn’t do. This came after Lemon spent several minutes making fun of Trump for acing his cognitive test. Apparently, at least for Lemon, it’s not so easy. I do appreciate that Chris Cuomo laughed about it and told him he has no acuity, though Cuomo then mistook the rhino for an elephant, making the entire thing even more hilarious. Trying to laugh this whole thing off was about the only move the producers had after Lemon made a such a fool of himself trying to trash someone the President.

In the end, it’s not that big of a deal that Lemon missed a question my pre-K son would get right. It’s funny, but not that big of a deal. What makes this newsworthy is the venom that Lemon constantly spews and was attempting to spew during this segment. Why is he wasting airtime trying to bash Trump for talking about taking a cognitive test? It’s his network that’s been obsessing over Trump not taking one. He took one and now he’s not supposed to talk about the results? But when it comes to Trump, he can’t win with these people. They’ll hound him about his cognitive abilities and then when he proves they are fine, they’ll mock him for taking the test to show they are fine.

There’s a fair bit of poetic justice in seeing Lemon go from mocking the President for passing his cognitive test, to seeing Lemon mess up his own cognitive test on air. Perhaps the CNN anchor will learn a lesson? I kind of doubt it though.