Who shows?

[detroitplayer]

If I call a bet on the river in LHE, the bettor shows his hand, and I go to muck, can the bettor request to see my hand?

Alternatively, if I make a bet on the river, show, and the caller mucks, can I request to see the hand?

And also, with whatever your response may be, is it like that in almost every casino or does it differ?

I THOUGHT I knew the answer to this, but a situation tonight, along with a couple people at the table agreeing, has caused me to rethink all of this.