American chat show host Jimmy Kimmel is famous for his 'celebrities read mean tweets' segment, in which he gets famous faces to read out all the nasty things people say about them online.
However, Kimmel found himself on the receiving end this past week after he aired a strongly-worded message for the anti-vaccination movement.
So, he put himself up for the mean tweets treatment - and rather than go through the process of an apology, he upped the game in defence of vaccination and scientific study.
"I'm not going to [present both sides of the argument], for the same reason I wouldn't present both sides if a group of people decided that pancakes make you gay. They don't."
If you're not exactly sure how vaccines work or what "herd immunity" is, here's a primer from the excellent Joe Hanson of PBS Digital Studios'
. In a nutshell, he argues that we've forgotten how horrific these childhood diseases can be.