It's been a while, but I've been re-watching all of season 12 again. The people who think it stopped being funny after like season 3 or something, are bonkers!

Also, I don't remember if I saw it before or not, since I had a smaller screen when it was first on. But the bit about some of those DNA "balls" being stuck to Sheldon's pants as he walks out the door, was nice. I wonder why they didn't come up short? Probably just for the joke.