Sometimes you feel weird laying down a monster hand, especially when your stack is on the shorter side. But sometimes you just feel something is... well, wrong. And this was one of those times.
Situation:
I had 21k coming into the hand. It was near the end of level 5, the final level of the day (each level is 2 hours). Blinds were 200-400 with a 50 ante. I had 44 in middle position. I opened to 1000.
Juan Maceiras, a very aggressive Spanish pro who is on Team Pokerstars, flatted me. He was to my direct left. He had toned down his aggression some after chunking off a lot of chips -- 120k to about 35k -- in approximately 3 1/2 hours.
A woman to Maceiras' direct left, who was pretty much his polar opposite (super tight and super straightfoward -- basically the stereotypical middle-aged white woman in the WSOP) also flatted.
One of the blinds also called.
There was something like 4650-4850 in the pot, and I now had 20k behind. Given the number of players seeing the flop, I planned to check/fold if the flop came with anything high or coordinated, except perhaps a ragged ace board.
However, the flop came 7c-6s-2d. I thought there was a fair chance I had the best hand.
Blind checked, I bet 3k.
Maceiras called.
The woman thought for a short time and called.
Blind folded.
My decision at this point: Check-fold turn unless I improve.
Pot size: A little less than 14k.
Turn: 4c

I was ahead of every hand except 66, 77, 35, or 85. There was no flush possible.
I planned to let Maceiras hang himself by check-raising all in for my final 17k. (He was very likely to bet if I checked to him, no matter what he had.)
I checked. Right on cue, Maceiras threw in 5000.
The woman then nervously said "raise to 8000", which was lol for a few reasons. First, she only had 10500 total, so only someone braindead wouldn't realize she was going all in. Second, the required min-raise was to 10k, not 8k.
The dealer informed her that she had to put in 10k instead of 8k, which she did, leaving herself 500 behind.
Right when she did this, Maceiras let out a frustrated sigh.
Back to me.
I thought about these scenarios if I shoved:
Maceiras folds, but I lose to woman: 6500 left for me.
Maceiras calls, I beat him, but lose to woman: 13k left for me.
Maceiras calls, I lose to him: I bust.
Maceiras folds, I beat the woman: I have 36.5k
Maceiras calls, I beat them both: I have 53.5k
Given Maceiras' loose nature, it was very tempting to shove, hope he called, and rake in the nice 53.5k as the day came near a close.
But....
Something just felt wrong.
Why did Maceiras make that frustrated sigh?
Why was he still betting into the woman on the turn, who didn't seem like she was going anywhere after calling the flop?
Why was the woman waiting until the turn to get her chips in, and why did she want to raise so little (even less than a min-raise)? Was she that hopeful to get callers?
I thought for awhile and couldn't decide. I mean, I had a freaking set. I only had 17k behind and the pot was already bigger than that. The average stack was probably in the mid-40s at this point, so how could I even THINK of laying down a set there? I had a good chance of getting up to 53.5k and having some chips to play with on Day 2.
But something just didn't seem right. I considered the possibility that the woman slowplayed a big pair. But what about Maceiras? Was I really ahead of both of them? What was my gut feeling?
My gut feeling was that I was going to either be busted or crippled if I called.
Maceiras then called the clock on me. That was pretty much the clincher. Now I suspected even further that he was trying to pull something, and even if he wasn't, I still had the realistic possibility I was behind the woman with 66 or 77 anyway.
As much as it pained me to do, I tossed my 44 in the muck just as the floorman counted down the final 5 seconds left to act.
Maceiras then instantly said, "I'm all in".
He flipped over 3c5c for the straight + backdoor flush draw. The woman tabled JJ. She was drawing dead.
River was Tc, giving Maceiras the flush he didn't need.
I would have been busted by Maceiras if I called. Instead, I had 17k to play with.
I finished the day with 19775.
I will need to double up on Day 2 to remain competitive, but it's 19775 more chips than I would have had if I had done what initially seemed obvious. I don't know what will happen in this Main Event -- and I'll need a lot of luck to cash at this point -- but if I do, I will always remember laying down a set of 4s with a short stack.