Feigned Stupidity Fail
When Nathan comes up with a great idea, which he frequently does, and let's the idea be funny, rather than noticeably trying to make it funny by doing schtick- those segments could easily qualify as the funniest moments on TV right now.
But when the idea is a bit sketchy, and he thinks he can make up for the lack of comedy by purposely acting stupid, it, imo, makes a bad segment even worse.
It literally took me 7 seconds to google 'cremation temp' and come up with 1400 degrees. Pizza ovens hit 650.
He doesn't do this a lot, and it doesn't completely ruin the show for me when he does, but I think the show could be better without the segment's where he's play acting stupid.