On Wednesday night I was invited by a mate to play poker in a pub in Battersea. Low stakes stuff (Dealer's Choice, £20 buy-in, 10p/20p blinds). As I was due to be in London on Thursday morning for a meeting anyway, I thought 'why not?' and travelled down.
Upon arriving at the pub, we're taken upstairs to a function room where me, my mate, and 2 of his mates from the London Poker Group, sit down at the empty table.
The seating was thus:
1. Me
2. Rob
3. Jonnell
4. Chriss
5. Mateyboy1
6. Mateyboy2
The first four hands are chosen to be Hold'em, and I'm up to £35. Hand 5 and it's Mateyboy1's turn to deal and he chooses 5-Card Draw.
I get dealt:

Mateyboy2 who has been knocking back the whisky at a rate of knots, shouts over "oy! barmaid, another double whisky"... Whilst saying this he leans back in his chair, but holds his hand with the cards in towards the table, meaning I see 3 of the cards in his hand.
They are:

The betting round takes place, with mateyboy2 betting £2, me raising to £8 and everyone on the table calling.
Mateyboy2 decides to change two cards (keeping the trip jacks I assume). I change 2 cards and get dealt:

Mmmmmm.. Quads, nice

The other 4 players change 1 or 2 cards each. The the next round of betting starts.
Mateyboy2 checks. I check my Quads. Rob to my left chucks in £10. Jonnell calls him. Chris folds, and Mateyboy1 folds.
Mateyboy2 calls. I raise to £20, Chris says "all-in", Jonnell says "call", Mateyboy 2 says "call", and I say "all-in" (I have everyone but Mateyboy2 covered by about a tenner). Mateyboy 2 dwells for a while, then calls.
Now comes the showdown.
Rob:

Jonnell:

Me:

Mateyboy2:

WTF?!
I then say to Mateyboy2 "that can't be possible. I saw your hand pre-flop and you held 3 Jacks, and only changed two cards. You can't end up from that with a straight flush..."
Mateyboy2 replies "are you accusing me of cheating?"
I say "Yes, I guess I am."
However, then Rob says to me "it actually is possible if he was holding, say,

and decided to chuck

".
No matter how unlikely I imagine that scenario to be, I have to concede that it is possible that is what has just happened, and apologise to Mateyboy for calling him a cheat!!
He says "f*** this. I'm not playing with someone who accuses me of cheating. I'm leaving." With that he storms out the room. The guy running the poker night then comes over and collects all Mateyboys chips off the table for him so he can cash in.
Mateyboy1 then gets up and says "I'm leaving too", leaving 4 of us at the table, stunned at what we've just witnessed.
It reminded me a lot of the scene in the film Croupier, when each player round the table has a better hand than the player before . e.g Pair > Two Pairs > Trips > Straight > Flush > Full House > Straight Flush.
Was I had? Or was I (and the 3 other losers) just very unlucky?
What are the odds of a 6 player table with 4 players holding: Flush, Full House, Quads, Straight Flush?
edit: realised I had the two mateyboy's the wrong way roundedit2: had listed the King of Clubs twice...