They do look very happy.
More to the point, the dude at the back looks REALLY happy (I can't remember his name...).
But then.
Look where Tyson's and Kenny's hands are.
No wonder the dude at the back is looking so happy... Ahem.
I rest my case. Beyblade is actually a very rude anime, disguising itself by making out that it's about spinning tops. Ahem.