Sack of coal

Alex is totally engrossed in Psychonauts. I need to figure out what to give him to eat. Alex likes having a chocolate spread sandwich in the morning.

Me: Alex, we only have enough chocolate spread for one sandwich. If you have it now, you won't be able to have a chocolate spread sandwich for breakfast tomorrow.

Alex: Okay.

Me: You could have some yoghurt for breakfast though.

Alex: Okay.

Me: So you want me to make you a chocolate spread sandwich now?

Alex: Yep.

Me: And you're fine with having yoghurt in the morning?

Alex: Yep.

Me: So do you want a sack of coal for your morning snack at school, then?

Alex: Yep.

Me: Okay.