Best Cameos on the show Friends

Not exactly a cameo, since they wound up giving him a recurring role, but casting Tom Selleck as Monica's scandalous older boyfriend was pure genius.

Bruce Willis played Paul the father of Ross' student girlfriend Elizabeth. Paul threatens to have Ross fired for inappropriate behavior, but then starts dating Rachel instead. Rachel thinks she's hit the jackpot until she asks him to "open up." Taking her request too seriously, he opens the floodgates and begins an emotional downpour of all his childhood trauma. Crybaby.

Monica and Rachel realise that Phoebe wants a stripper at her bachelorette party, but since they haven't planned ahead they just call the first one they find in the phonebook. This is an excellent lesson on the importance of researching your strippers beforehand, because the stripper who arrives at their doorstep is none other than Danny Devito. Short, old, and unfit, his dancing was cringe-worthy to watch, but also hilarious.

I'm not sure if his character ever gets a name, but Phoebe is dating him after he hires her to sing songs to children. Phoebe comes up with the most inappropriate songs possible, thinking that children "want to hear the truth." She is eventually fired, but at the end of the episode the two sing a duet of Phoebe's "hit" song Smelly Cat.

So the Friends go to see Ross' old pet monkey ... wait, have you heard this one already? Anyway Chandler runs into an old school friend, Suzie, who immediately begins to hit on Chandler. Chandler is ecstatic, and doesn't seem to think there's anything fishy about the fact that this girl he used to tease is totally into him now. She somehow convinces him to wear her underwear under his pants when they go out to dinner one night. Then, thinking she wants to get it on in the bathroom, Chandler strips down in a stall, only to have Suzie run off with his clothes as a form of retribution.

After Chandler can't stop staring at Monica's super hot cousin Cassie, they send her to Ross' apartment. But Ross for some reason misreads her actions and thinks she is hitting on him. Finally they send her to stay with Phoebe, thinking this is the only safe option, but she too falls for the gorgeous visiting cousin.

Parker seems to be the perfect boyfriend for Phoebe until the gang complains that he is too positive. Once they say this, Phoebe can't help but be annoyed by his obnoxiously over-positive view on everything. Eventually Phoebe snaps, shouting at him in one of the few scenes were Phoebe ever gets mad. One of my favorite lines of the show ever: "Wrong? Really? You know the word wrong. Everything isn’t perfect? Everything isn’t magical? Everything isn’t a glow with the light of a million fairies? They were just brake lights, Parker!" Poor Parker, he explains that he was just trying to put a positive spin on a traffic jam.