An impertinent university freshman took it upon himself to explain to a senior citizen standing next to him at a bus stop that it was impossible for older people to understand his generation.
"You grew up in a different world," the student said in a voice loud enough for the other passengers to hear, "actually, an almost primitive one."
The elderly man said nothing.
The student continued, "The young people of today grew up with televison, jet planes, space travel, man walking on the moon, our spaceships have visited Mars. We have nuclear energy, electric and hydrogen cars, computers with light-speed processing and.."
The student paused to take a breath and the senior took advantage of the break in the young man's litany and said, "You're quite right, son. We didn't have those things when we were young... so we invented them. Now, you arrogant little twerp, what are YOU doing for the next generation?"
The applause was resounding.