There"s an idea circulating around various forums (at least that I"ve read) that the rules should be changed so that AT SHOWDOWN ALL cards MUST be turned over.
In fact, I"ve seen this enforced at a couple of casinos in the UK (on the APAT trail). No mucking about, everyone table your hand and the dealer pushes the pot and moves on.
No arguments about who shows first, asking to see those cards etc....bam, problem solved!