As the title says, which films have instances where there was a minor appearance/cameo by someone who isn't really considered an actor, and which you genuinely enjoyed.
One of my picks, despite (or maybe because of) how absurd the role was, was Elton John, in the 2nd Kingsman film. I found myself at least smiling through most of the scenes that featured him.
Note: The person can either make an appearance as their real, celebrity selves, or they can be playing an actual character. Both are valid.
__________________ Never take life seriously. Nobody gets out alive anyway.
__________________ "Your mother was a venereal disease-ridden prostitute who was raped by the father you never knew and killed herself when she saw what an autistic phaggot you are.
So what about my comments made your ass so sore? Was it me calling you a phaggot? I think not." - Nemebro
And you have to admire his commitment as well. It'd be great if the fan theory (that it's the same being in all the instances) ended up being fully confirmed (Feige has just teased the idea in an interview before). Because then he would have RDJ, Jackman, and the like, beaten by a country mile.
Well, not necessarily a Watcher, but could be something. This is what Feige teased:
And given the whole Fox deal (considering his cameos aren't limited to the MCU), they have even more freedom to turn this into something genuine if they ever actually wanted to. Not that they necessarily ever will, obviously.
__________________ Never take life seriously. Nobody gets out alive anyway.
Mike Tyson in THE HANGOVER movies:
"I'm Mike Tyson, i've seen everything."
Billy Idol in THE WEDDING SINGER:
"Get out of my way, Billy Idol!"
Chuck Norris in DODGEBALL:
"Thank YOU, Chuck Norris."
Billy Zane in ZOOLANDER:
"Its a walk off!"
Kareem Abdul Jabbar in AIRPLANE:
"Listen kid! I've been hearing that crap ever since I was at UCLA. I'm out there busting my buns every night! Tell your old man to drag Walton and Lanier up and down the court for 48 minutes!"
If we're including TV (king of Jordan was in ST:TNG), then First Lady Michell Obama was on eps of iCarly and Jessie, as she shows no favoritism between Teen Nick and the House of Mouse.