Everyone tells you it's the big one, you have a big party - get hammered, pull a munter and fall asleep before midnight (because you're old).... and wake up the next day with the realisation that you are no longer 18.
shit. only the wasteland of the 20s and beyond to come.
childhood's over.
uni's over.
it's job time.
and let's face it, you're getting a bit fat.
most tragically of all you're going to joke about pretending to be 21 for the next 10 years.