Small pot, deep stacks.

[pzhon]

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I think if he is bad enough to call with 8, don't you think if you lead 2/3 pot on river, he might reraise and then make a crying call there? So there is a chance you get his stack anyway if he has the 8 and there is some good chance he calls you 2/3 pot size with any other marginal hands?

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That's an alternative line. However, I think he won't often pay off even a 2/3 pot without an 8, and I think I'll get paid off much less on average when he has an 8. Some players would check-raise with only an 8, and then feel pot-committed to call a push, but some players would fold to a 3-bet and many would just call rather than check-raising.