(There are no spoilers in what follows)
Rather belatedly, I saw Guardians of the Galaxy, Vol. 2.
An absolutely wonderful film.
At the end of the screening, only three of us sat through the end credits in the cinema.
The rest of the audience missed the five – count ‘em – FIVE – extra bits of full-screen live-action scattered amid the credits.
I am enthusiastic about film-makers doing this. It is an added bonus for genuine movie lovers.
Frankly, if people walk out before the end of the movie, they deserve to miss out.

What they missed at the end: On Her Majesty’s Secret Service
I have never been sure if this was or was not an intentional fake ending put in by director Peter Hunt.

Carrie – the 2nd most frightening sequence I have ever seen

The original Night of the Living Dead – cheap but terrifying
Next to a particular unexpected shot in the middle of George A.Romero’s original Night of The Living Dead (1968) where those who have not seen it before almost always let out audible gasps, it is the most frightening shot I have ever seen in cinema. The bath scene in Les Diaboliques (1955) had little effect on me.
But, as well as admirable shock and fake endings, there is now a scattered genre of additional sequences at the end of films – Marvel have virtually annexed it as a house style, thus the FIVE additional sequences in Guardians of The Galaxy, Vol 2.

Kong: Skull Island had this extra end-teaser plugging a sequel
Movies as far back as Airplane! (1980), Ferris Bueller’s Day Off (1986) and American Gangster (2007) have used them fairly inconsequentially. At the end of Lethal Weapon 3 (1992) Richard Donner and Joel Silver blew up an entire mega hotel for no reason. Just as a bonus, I suspect, for anyone who had sat through the credits. Good for them.
But I remember at least two addenda where the REAL ending of the film was missed by a large number if not most of the audience who just left when the credits started.

After the Young Sherlock Holmes‘ credits finish, there is a major plot revelation and someone raises an eyebrow
The credits rolled and then there was a long additional sequence which ultimately climaxed in a revelation about one of the central characters in the film which totally changed your understanding of what had happened.
L.A. Confidential (1990), has a relatively up-beat ending but, after the end credits have rolled…

L.A. Confidential: British TV viewers almost never see this end
Returning to Guardians of the Galaxy, good old Marvel included a brief (unexplained) sequence with their character Howard The Duck in the first movie (2014).

Howard The Duck – appallingly buggered-up by George Lucas so he was nothing like the grouchy character of the comics

Maestro Stan Lee appears in Guardians of the Galaxy, Vol.2
Howard The Duck makes Rocket Racoon seem like Mary Poppins.

Howard The Duck ran for President of the US in 1976. Maybe he should do it again…