[jwells89]

In a similar vein, ending with an ellipsis (…), while used by many to indicate thought, consideration, or other sort of pause in speech often comes across to younger readers as a sort of passive aggressiveness or shortness of patience.

[Gigachad]

Surely it’s always meant that. It’s just a long pause.

I’d think something like “are you serious…” would be pretty universally understood.

[astrange]

It's interpreted as old person, because there's a class of boomer that ends all their sentences with … and then puts them in the middle of half of them too.

[jareklupinski]

and just when you think you've solved the ellipses and fullstop, someone comes along and hits you with the:

  ..

[hoosieree]

Aerodynamic semicolon.