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The rule is that you have the "privilege" to see a called hand at showdown. Operative word is privilege. Most of the rule books I have seen are worded this way and that privilege may be revoked for abuse.

My favorite story regarding this was pulled off by a friend of mine who executed the greatest slowroll ever. An old man was asking to see every hand at the river. After asking to see my friend's hand multiple times he was fed up with this guy.

A hand came up where he made the nuts on the river and just smooth called the old mans bet. The old man showed his hand and my friend declared "nice hand" and placed his cards face down in front of him. The dealer began swiping them in when sure enough true to form the old man said "I want to see that hand" Blam over comes the nuts, the pot gets reawarded, old man freaks out, and never asks to see a hand again.

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That is the best poker related in-your-face pay-back story ever. Hands down.