Modern day teenagers are very aware of the need to keep hydrated and like to use this as justification to get what they want. They often ask to go for a drink during lessons, which isn't allowed. If they're organised enough to bring a bottle of water with them before they're welcome to drink it but if not then it's just tough. The same applies to me if I happen to leave my water bottle in the Maths office so it's perfectly fair.

One of my year tens asked why it was okay for me to drink my water in the lesson. Aside from the above I came out with:

'Because I have to do alot of talking'

'But sir, so do we!'