I was north holding ♠53 ♥AK8542 ♦942 ♣Q4 and I was the dealer.
I preempted 2♥ and the bidding went on
West North East South
- 2♥ P P
Dbl P 3♣ P
3♥ P P P
When it comes to the second round for west to bid, he bid 3♥. I thought it was some kind of convention that I dunno, and passed, until east thought for an exceedingly long time, and then also passed (!). South obviously passed.
At this moment, the contract was displayed... 3♥ West
Everyone went into confusion
In the chat, West said "????"
East doesn't respond, he was dumbstruck
I also said "????"
Amid the confusion, the computer asked me for the opening lead. I couldn't hink of anything better to do, so I drew trumps and led the ♥A
Dummy only has 2 hearts...and declarer played ♥7 from dummy, and then left out of fury
East said "What was that 3♥ about?"
Further investigation revealed this was what the full hand was
Anyone knows what's happening at and after the 3♥ opening? I haven't got a clue!

Help

Contract: 3♥W
Opening lead: ♥A