We are sort of Will Ferrel fans, especially dh(old SNL stuff, not his movies so much for me). I was very disappointed to hear this prank, whether it was real or not. I did not find that interview funny, either. They were all just trying too hard, and it did not work.
But, really, I doubt a Kraft service person would deliberately taint a food like that. They must have to be cleared to be near stars in those jobs, no? So, yeah, seems unlikely it really happened.
So stupid though.