Because one moment you might be taking tequila shots with a 62 year old professor and the next you might be hit by a truck, spinning across ice, and end in the hospital.

so when in doubt, do those bucket list things you have the opportunity to do, but are too shy/scared/whatever to attempt.

you won't regret it ([i]again, within reason, you heathens[/i]), and life is fragile/could end anytime/etc.