Tom Brady was PISSED Robert Kraft caught a stray during Sunday's G.R.O.A.T. ... and now we know why -- roasters were explicitly told NOT to make any happy ending jokes, a directive Jeff Ross ignored!
Comedian Andrew Schulz, who was a part of the show, provided a bit of a peak behind the curtain, revealing massage cracks were out of bounds.
"I think that was 100% real," Schulz said on his Flagrant show, explaining, "The reason why I think it's real is because they told us no jokes about happy endings with Robert Kraft.