Tomas (Robin Williams) and Tim (Billy Crystal): two strangers at the coffee shop. Appearing at the beginning of "The One with the Ultimate Fighting Champion", they perform an otherwise pointless cameo/skit performance while sitting on the group's sofa at Central Perk. They are not mentioned in the credits. Tomas begins by asking the friends to move over to make room for the pair which they do. Then Tomas complains to Tim about how he thinks his wife is cheating on him with her gynaecologist. The friends stop trying to have their own conversation and eavesdrop. Eventually Tim reveals how he's sleeping with Tomas' wife causing Joey to rather crassly interrupt their discussion to ask if Tim is the gynaecologist Tomas was earlier referring to, only for an irritated Tim to tell him to mind his own business. Bursting into tears as he absorbs the fact that Tim has been sleeping with his wife, Tomas starts shouting at and insulting Tim, and ends their friendship before leaving the shop in a loud fury, followed by Tim, who gives the six shocked, bewildered friends one last embarrassed, apologetic look before he leaves. Robin Williams and Billy Crystal were filming nearby and adlibbed all their lines.