"Can I...?"

It suddenly dawned upon me how many million times I hear this same question everyday... "Mr ****, can I go toilet (optional: please)?"

Being the nice teacher I am, I say "Yes" a million out of a million times. But what "Yes" actually means is "Huh, you want me to say no and risk giving you bladder malfunction and having your parents hounding me for the rest of my sorry existence on Earth? Not a chance. So yes, please go, even though you may not really be urgent but just wanna smoke pot in the loo."