Ed Helms interview about working with Will Ferrell?

Will Ferrell is hysterical (De Angelo haters to the left please) and on every re-watch I find more and more moments where the cast is trying their best not to break character in a scene with him. Specifically, Ed Helms is always the closest to breaking! It tickles me so much. Does anyone know of any comment he's made about his experience with Will on set?

I also love watching John Krasinski in a scene with Creed, since he's gone on record as having said Creed was the funniest to him on set.

Special mention to what I recall some of the cast have shared was the funniest scene to film in the show: S6E13 "Secret Santa", when Michael gets Kevin to sit on his lap and then his leg goes numb. Ed hiding behind the wall to the entry is too funny!