Fellow journalist and bridge streamer Jean-Claude Legrix reported this deal from the quarterfinals of the World Team Championships.
Five clubs was reached five times on these North-South cards, yet no declarer managed to find success with that contract. Three no-trump was slightly better, but an auction such as this one, conducted by the Swedish seniors, seems reasonable to me.
On the spade king lead to the ace, each declarer played a club to the two and ace. From there on in, the contract had no chance. Declarer had to lose two clubs and a heart.
Once West followed with the club two, the contract was makeable if declarer played low from dummy. This could be considered a safety play, allowing for a 5-0 trump split. If East wins, declarer can later cash the club ace. Then, if East shows out, declarer crosses back to hand to finesse the club jack. On the actual (admittedly unlikely) layout, the contract would succeed.
Note that the contract can be defeated legitimately if West splits his honors on the first club. With diamonds 4-1, declarer cannot avoid two trump losers. To be fair, though, if clubs are 3-2 with the queen onside, the safety play will cost an IMP unnecessarily — and that happens one-third of the time — if the contract in the other room is five clubs. The 5-0 break onside happens only one time in 50. So while the swing is far greater for the successful safety play, the small loss nets out the gain in the end.