So this is a scenario I was in over the weekend in a pot up in Tahoe at the $3/5 NL game. $1,000 max buy in, cash game. Full table. Pretty action based, straddles just about every hand for $10 and $20. A couple of rocks / conservative players, and a few action junkies.
Three players going to the flop. One short stacked. Two large stacks (myself and LJ ((Little John is his name)) .
In the 2nd cut off seat I hold

.
I open preflop for $80 and get 3 callers. Me, SS ,and LJ
Flop comes
I flop the nut joint with a backdoor diamond draw. S/S player moves all in for ~200 or so, there is about $275 in the pot. LJ calls, I call.
Turn is a
LJ wants to check to me... SHOWING me his cards and says "I can't open a side pot with you because I already have the straight"
I tell him that his straight might not be good. He gets a little defensive about his hand, and says "OK then, I bet $400 that we have the same hand and we are chopping it... you and I both have A/K"
I go into the tank a bit and ask myself if I call here what is the advantage I have, and if I raise here, do I create a different advantage? How do I manipulate this pot to a) NOT chop with him... and b) ALSO take the side, which he just opened for $400.
I've got about $3500 in front of me, and I move all in. LJ blows a gasket. Blows a gasket because I'm making a move on the pot. I tell him I have 9 outs to fill up, trying to get him off his hand, and disguise my joint and make him think that I have a set. He goes into the tank and calls time. Meanwhile the rest of the table is in hysterics and jabbing LJ for me making a move on the pot. (he just took a horrific beat a few hands earlier)
To my surprise, LJ FOLDS! Short stacks opens his hand to show K/9 which clearly had 3rd place locked up. River was a blank, no diamond, so I missed my backdoor flush, but took down the side that LJ opened. LJ was NOT happy about being blown off a chop/chop hand with another player all in, and he [LJ] was guaranteed 1/2 of the main pot.
So I take down the main, and the side that LJ opened up which had $800 in it, $400 of his.
It was an interesting play, and one that I have never made before, where I just about knew 100% at the flop that I was chopping it with LJ on the flop, but made a move on the pot and blew him off the same hand I held.
I hope I'm able to get in this situation again to see if the conditions warrant trying the move again.