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Hurry up, else we'll be late. You'd better leave now, else you'll miss the bus. Do what I say, else there'll be trouble.

If the addressed person does not comply, you can also add "or else" in a threatening tone.

Such a funny movie.

That is exactly the correct UK usage.

I don't think that is normal UK usage. It sounds odd to me without "or" before the "else" in those sentences. From other comments here, that seems to be true for others too.

"Someone else" sounds correct but else isn't trying to act as a conjunction there.

More common in the North and Scotland, I think.

Scots (the Scots language, not Scottish English) tends to use bare "else" wherever "otherwise" is used in English, so I assume it's coming from the Northumbrian dialect of Middle English and leaks through to those dialects of Modern English with more Northumbrian influence.

That's how my UK friends speak. Maybe it's a regional thing?

someone else ;-)

Perhaps after the robot uprising... https://www.smbc-comics.com/comic/the-program

Else could I?..