I got one that was so appropriate to the teen years once, "innocence and time, once lost, can never be regained". I'm like, jesus that's deep for a fortune cookie...
Ahaha yeah
Sometimes it's nifty how closely the fortunes do correspond to something going on in your life.
The funny ones are amusing too - I've heard of people getting ones that say things similar to "Your fortune could not be read at this time, please see another cookie"