Okay, sure, all of the knights of the round table after Arthur and Merlin get their shit together and finally court being like “yeah, we knew” is funny because none of them thought to tell them what they all saw, BUT

I present to you, all of them being literally so thrown off by this new development that really isn’t so new. Because they see Arthur and Merlin together all the time, sure, but only while they’re with them. They don’t see the private moments we do, or the carefully intimate conversations in the night when they’re alone in Arthur’s chambers. They don’t see Merlin smoothing out Arthur’s collar after dressing him when he doesn’t need to. They don’t see the domesticity when Merlin is polishing armour by the fire in Arthur’s chambers and Arthur is reading updates from the lower town nearby in total silence. Etc etc

Because let’s be real, all of the knights would die for Arthur or each other, that’s what being a knight is all about, so they figured that Merlin wasn’t any exception. They don’t truly realise the lengths he truly has gone for Arthur.

Leon has been around since the day these two literally MET. Merlin nearly commit regicide his second day and then saved Arthur from the sorceress by the third. Gwaine loves how Merlin doesn’t fall into line with hierarchy roles but can begrudgingly see why he’s so loyal to Arthur, cause he has his moments. Lance respects and admires Arthur a lot, especially after knighting him, which has always been his dream, and knows of the prophecy from Merlin as his one (1!!) in-the-know friend, so he suspects it’s just that. Elyan knows his sister is in love with Arthur, half of Camelot’s court ladies are for Gods sake, but she and Merlin act extremely different around Arthur, Merlin being so much more comfortable around him than Gwen, so he thinks it’s more of a brotherhood like the knights bond. Percy is a bit more perceptive of this, especially considering both Merlin and Arthur never really fall in love with anyone else around them the entire time, they’ve never seen Merlin in love period since they never met Freya, and Arthur had courted before but most of it was arranged or a product of his duty to the throne.

So when they’re like “lol guess who’s finally together” all of the Knights are collectively losing their minds, and replaying everything they’ve ever known about them in their minds since they met.

THAT is comedy