Why does my mum keep nagging about paying dinner money?

Today Mum got this text from school. I don't know why she's cross. It's not as if I haven't paid any dinner money for ages. It's not as if it's lingering around in the bottom of my school bag. (What's that? It is? Oh dear. I'll try saying I didn't know it was there.) I didn't know it was there! I hear Mum each hot dinner day say "The money envelope is in the front of your bag dear" but I don't really listen. I'm too focused on getting my Match Attax swapsies ready to take to school.

I'll try better tomorrow, Mum, honest. Now where's Darren Bent?