W/All		♠	A K Q 7 6
		♥	K J 10
		♦	Q 6 3
		♣	A K
♠	5
♥	A 7 3
♦	A K J 8 4
♣	Q 10 8 2

West leads the ♦A, East contributing the ♦7 and South the ♦5. EW use classical signals, so high-low is a 'come on'-signal.
How should West defend?

N/—		♠	10 8 7 3
		♥	A K 7
		♦	Q 10 8 5 4
		♣	J
♠	K Q J 4
♥	10 5
♦	J 3
♣	Q 10 8 6 4

¹ 19-21
² Puppet Stayman: enquires after South's holding in the major suits
³ Neither a four-card nor a five-card major suit
⁴ Quantitative raise (invitational to 6NT), therefore not forcing
⁵ Maximum

Optimistic bidding by North! Even if South has the maximum 21 points, the sum in NS still only adds up to 31. On the other hand: North's five-card suit is often valuable but 6♦ might be better...

Of course West leads the ♠K, which wins.
It is time for West to show what stuff he is made of. Which card does he play at trick two?

W/All		♠	A 6 5
		♥	K J 7 5
		♦	K J 8 3
		♣	A 2
♠	K 9
♥	A Q
♦	A 10 9
♣	9 8 6 5 4 3

¹ Take-out

This was the bidding at one of many tables at the 2004 European Championships for teams in Malmö, Sweden. A strange auction, but not an impossible one: East is unwilling to sell out in 1♠ and South suddenly comes up with a jump: it's clear he has six spades but had too few points to jump in spades at the first round of the bidding.
Anyway, at most tables South declares 4♠, although after different auctions.

Almost any West leads a club. Our West elects the ♣4 (third or fifth best). Declarer wins with dummy's ♣A (East the ♣7, South the ♣10) and returns, somewhat surprisingly, the ♣2. East wins with the ♣Q, South the ♣J.
Which club should West play to this track to save East from embarrassment (after all, East could have passed 1♠, so if NS make 4♠, East will have egg in his face)?