10. The trouble with double

At the Year End Congress some years back, I played with Zeb and this was our hand of the match. East opened a weak 2♦, Zeb overcalled 3♣. West leapt to 5♦, I bid 5♠, which Zeb raised to 6♠. West now bid 7♦. I, of course, bid 7♠ since Zeb must have the two black aces to bid 6♠. East doubled ho ho. Not surprisingly, + 2470 was a complete top.