Free Step Dodge

What size would you like your milkshake to be? "Normal"
So small, medium or large?
"Just the normal size"

That's when u just give them what u think they want cause clearly they don't know what they want, so yeah I would interpret normal as medium

Assuming you're serving US customers "Normal" should translate to biggest size you have.

I'm one of those people....

I don't eat out alot so I just want normal everything.

You gotta understand if you give people a choice about stuff they know very little about then you're going to get those types of responses.

Doesn't sound that vague to me... I can easily guess they mean Medium by "Normal"