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Trying to get a cheap showdown if his hand is fair but not strong, or inducing and picking off a bluff. I think there was a thread on this play in the WPT forum where Kirill Gerasimov did this a few times.

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Well if he claims the other player checked that could be an angle, but merely turning over his cards doesn't get him a cheap showdown,

I don't know how you can gather from the information here that this could be an angle to induce a bluff (and I'm not convinced that inducing a bluff is an angle). In fact if this occurred in a cash game noone would consider it a problem. The only reason it is a problem in a tournament for cards to be exposed is that potentially impacts the other players (Player exposes his hand to keep a player from drawing against when if the hand wasn't exposed one of the two players would end up busting or being crippled -- I don't consider this an angle it just the justification for the rule against exposing cards)