If you have seen Finding Nemo you will know that little Nemo tries to escape the aquarium by jamming the filter. In a sad twist tonight, we discovered our own Nemo (a guppy with a stripey tail) had died, he appeared to have attached himself the filter. (If it wasn't so sad it might be vaguely amusing.)
My son, watching as we extracted him, said quite cheerfully: "So now we only have SIX fish." At which point I told him very sadly that Dave had died the day before. "So now we have FIVE fish" he announced.
He's great at mathematics, and has a cold heart (where fish are concerned)!