Bad flashback!
This hasn’t happened in years, but after ages without any symptoms at all, I now have “Mahna Mahna” stuck firmly, irrevocably in my head. And the only way to deal with it is to actually play it, because when I sing it I really rumble out the “mahna mahna,” and tear out my throat. (It turns out there are a lot of “Mahna Mahna” sites out there, mostly focused on The Muppet Show version. Click it for the video!)