Spider-Man (2002)
The Cameo: Macy Gray can be seen giving her vocal chords a workout just before the Green Goblin shows up to ruin all the fun.
Why It's Bad: This fairly shameless attempt to tap into the popular culture of the time has had the unfortunate effect of dating the movie horribly. What’s Macy up to these days? Anyone?
Sleepwalkers (1992)
The Cameo: Stephen King is fond of popping up in his own work as he does here, appearing as an irritable cemetery caretaker.
Why It's Bad: King is arguably the greatest living horror author, but he's no actor and this extended cameo feels feature-length.
Beverly Hills Cop 3 (1994)
The Cameo: George Lucas inexplicably appears as a disgruntled punter in the queue for a fairground ride. Lovely jumper…
Why It's Bad: Lucas's plaintive "hey!" makes us feel so very sad.
Little Nicky (2000)
The Cameo: A grinning Ozzy Osbourne shuffles into shot to provide the big finish in Adam Sandler's supremely irritating comedy.
Why It's Bad: Sandler's bleating "Ozzy?" is enough to make us want to call it a day, and that's before the shockingly wayward CGI kicks in...
Finding Forrester (2000)
The Cameo: Matt Damon crops up as none other than Will Hunting. Yes, this is another Gus Van Sant film…
Why It's Bad: Finding Forrester already feels like an inferior retread of Good Will Hunting , and this just rams that feeling home with interest.
Men In Black 3 (2012)
The Cameo: Justin Bieber and Lady Gaga give the tweens in the audience a wave by making blink-and-you'll-miss-it cameos as a pair of aliens. Because they need the exposure, you see…
Why It's Bad: Where previous MIB cameos had been amusing, this is purest, undiluted cynicism. They're only on screen for a split-second, and yet the press was full of news about their "cameos" in the run-up to the film's release...
Eurotrip (2004)
The Cameo: Matt Damon again, this time appearing as a pierced, skinheaded rocker in this dire teen sex comedy.
Why It's Bad: God alone knows why Damon, at the height of his fame, would agree to this shocking karaoke routine. Although he does get to use the phrase “freakiest little sex puppet”…
The Dead Pool (1988)
The Cameo: Guns N' Roses pop up at a funeral in this Dirty Harry thriller. No explanation is given.
Why It's Bad: It's totally incongruous, that's why. Slash is wearing his top hat for heaven's sake!
The Postman (1997)
The Cameo: Tom Petty appears as… himself? in a post-apocalyptic drama? Eh?
Why It's Bad: Nonsensical and self-satisfied in equal measure. "I know you… you're famous." "I was once…"
Die Another Day (2002)
The Cameo: Madonna sang the theme tune, so it’s only right she should get a cameo, right? Right?
Why It's Bad: Dismal innuendo plus wooden delivery equals a truly horrible scene. At least the theme tune was… oh.
Sonic 3 director explains the thinking behind picking those new post-credits arrivals: "It's always 'which character is going to give us something new?'"
The Inside Out 2 panic attack scene is one of the best depictions of anxiety ever – and something Pixar director Kelsey Mann is incredibly proud of: "I couldn't be happier"
