Hell I thought I had heard most of them.
Mostly of the "we was robbed" variety.
However today I saw a new one from the outgoing coach of Serbia & Montenegro who is quoted by the BBC as saying one of the reasons his side lost 6-0 to Argentina was

"All teams at the World Cup sing their national anthem but ours is booed. It's hard to play in such an atmosphere."

As The "old" Yugoslavia natinal anthem was played rather than the Serbian

Anybody else have have any pathetic excuses for losing?