Yes! They look at you like you just fell off a spaceship or something! It's the Mandatory Mayo Conspiracy- resistance is futile!!!
It's not as bad as the fries conspiracy.
Me: A burger please
Numpty: With fries?
Me: No.
Numpty: So, one coke, one burger, with a side of fries?
Me: No fries.
Numpty: [confused look] What?
Me: No fries. I don't want fries. Just the burger.
Numpty: Er. You want a burger with no fries?
Me: Yes.
Numpty: But it's cheaper if you get a combo.
Me: I don't want fries.
Numpty: Are you sure?
Me: YES!
Numpty: Ok.
[Five minutes later, order comes out with fries]