I can sump it up
This moment was after "Blame it on the girls". Before the song, Mika divides the audience : those on the right sing "Blame it on the gi-i-i-irls", those on the left (where I was !) sing "Blame it on the bo-o-o-o-oys".
This time, Mika did something amazing : he stepped down from the stage into the audience ! (I hope you understand what I mean in English...) And joined the crowd to explain to us the thing and to make us sing
Anyway, at the end of the song, he said that those on the left were the best. So we began to sing "On a gagné " ("We won") and he said that was just like a football team. But you know, these days, in France, we don't like our football team really much, so we protested ! And he said (this is a summary, not a real translation !) : okay, you know, I can't even play football. When I was a child I was the goalkeeper but the only thing I did was playing with mud. Indeed I made figurines of the other guys who were in the team. They were like voodoo figurines so when the other guys, from the other team, went in front of me I couldn't prevent them from kicking a goal but I was happy since they crushed the mud figurines, which meant they crushed the other guys. But I wasn't able to be a goalkeeper so I got fired. I was really disappointed (that was ironic, as you may have guessed...)
After that, it was time for "Billy Brown"