When Crowley mentioned Purgatory, Sam said, "You've heard?" Was Purgatory brought up before then?

The alpha vamp talked about it before Crowley showed up, if I have my timeline correct.

Yes he did. I think that Sam was surprised that Crowley knew what was going on, because Sampa tends to keep things close to the vest.

I was surfing for some references for my next picture, and stumbled upon this, which asserts D/C fails the broccoli test. I would tweak it a bit so that Dean wanted the broccoli for Sam, but those boys aren't talking vegetables when they eyesex.

Even though I anti-ship them, I think Dean/Sam totally would pass. Just that Sam might refuse. But he knows what Dean wants.

I don't know - I agree that Sam knows what Dean wants but think he would be so taken aback that Dean wants a green vegetable that he would second-guess himself (prior Sam, not RoboSam) and stand there, helpless, in the produce aisle. Now if it were the pie test....

Even though I anti-ship them, I think Dean/Sam totally would pass.

They do pass the broccoli test.

God, they hit my competence kink with silent communication. I think I need to fire up some S1 later today.

I think the key for the Winchesters here isn't silent communication--it is indeed getting on the same page with that information.

D/C I envision more as "Broccoli." "Sex?" "Sex! No, broccoli." "Green what?" "OK, sex."

Is the broccoli test something I should know? Or is it just in that post, which I cannot access from my phone? I am curious about this test.

The broccoli test is a test of eyes only communication for your OTP. It's from Professionals fandom, so old school.

The idea is, can Dean convince Sam to pick up some broccoli at the vegetable section without actually saying "Dude, broccoli." I think if the Winchesters need to communicate worldessly about anything that's not feelings, they've got it down pat. Castiel, on the other hand, isn't communicating. He's just looking at Dean's soul, and even if Dean's mind should (aberrantly) demand broccoli, his soul will never be that tainted. Cas would just get him pie, instead.

high protein chocolate muffin:

From fanlore:

The term came out of a humorous real-life situation. Sandy Herrold and her friend Charlotte were in a grocery store together, at opposite ends of the produce section. Both were heavily into The Professionals at the time. Sandy tried to communicate to that she should pick up some broccoli without shouting across the store at her. No amount of pantomiming and mouthing of the words could get the point across to Charlotte, so Sandy told her later, "Doyle would have known Bodie wanted him to pick up some broccoli with just a raise of his eyebrow!"

Thus, Bodie and Doyle would have passed the broccoli test. It is frequently shorthanded even more to "have broccoli" -- a pairing is said to have broccoli if it can be proven in canon that they understand one another well enough to pass the test.