To most people right now, using a DVD is a thing of the past - as we live in an age where you find find just about anything via either a subscription to something like Netflix, or by just googling it.
And while this is mostly a great thing, it's not without downsides: like the death of the humble DVD extra. Seeing commentary or recorded footage from behind the scenes of a film was always an exciting concept, since you liked the film enough to buy a DVD of it in the first place.
It always felt like a weirdly kind gesture, too - as someone in the production team thought people would like an extra feature so much they had it added in. Even if it was a totally sub-par game you had to use your remote to awkwardly control, you can still appreciate the effort.
But some films went much further than this with their DVD extras. Much, much further. Between hidden musicals, hilarious treats, and cruel pranks, many films have such insane bonus features that it almost makes you wish that DVDs were still a huge thing.