Silly? A Monkey Island game? That's the second craziest comment I've ever read.
Alright, I'll bite - what's the first?
It's a riff on a quote from the game.
> That’s the second biggest $object I’ve ever seen!
– Guybrush Threepwood, when seeing something big
I think they may have gotten this from Get Smart (where it was also a running gag), although it seems like they managed to make good use of it in their own right.