Schwimmer then went on to talk about several aspects of working with Katie and Monkey, who shared the duty of playing Marcel on Friends, and claimed that the animals often missed their marks and messed up his timing on the series, along with eating live grubs while sitting on his shoulder and getting their “grubby hands all over” him.
As Mike Morris noted, Schwimmer’s earlier comments about working with the animals had already annoyed him so much that he’s never watched Friends, but after holding his tongue about the actor’s thoughts on Katie and Monkey, he could no longer put off responding.