I really messed this up myself, but just interested in seeing who made the biggest dumb move. I feel my partner and I were both bridge sinners on one board!
My bridge sin committed...falling asleep at the table.
Contract 3NT (opps)...my lead with...
Kxx QTxx Kxxx xx
4th best heart led, single 9 from dummy. Pard takes the K and opps win with A immediately. They go on to play clubs and cash Qxx AKxxx. On the 3rd club, partner is out and plays the ♠4. I notice it is low, look at my hand and understand based on the bidding it is realistic for partner to hold the ♦A. I soon doze off, unaware that I am now a sinner. On the next club, the 3 is thrown while I am daydreaming about who-knows-what.
But this is where partner has sinned...Giving partner an opportunity to make a mistake. Holding 843 in spades, udca count/att/lavinthal. There is no reason for partner to consider the ♠8 as a valuable asset.
In conclusion: Pard holds 843 KJxxx xxx xx. I thought if he had 4 hearts without the jack, I should obviously let him in on diamonds. Lost in my thought, I forgot to look at his next toss and missed a valuable marking.
Who is crowned King of the Sinners?
Disclaimer: I mostly made this post for laughs and to share my own stupidity.

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