Signs there is a teenage boy in the house

1. You look at the small amount of meat for dinner and think it can't possibly be 1 kilogram. You weigh it and realise it is.

2. You take a medium saucepan out of the saucepan cupboard and then go back to look for the large saucepan. You realise that you are already holding the large saucepan.

3. Your 17-year-old son asks you what he can have for a snack while you are making dinner. You direct him to a packet of biscuits in the pantry. 10 minutes later you notice the empty packet in the bin.