One fine day, the robozoom had to deliver a particularly important parcel, and his route led across the very, very old bridge. This time, if possible, he was even more ruthless in pushing aside those waiting to cross. When he saw that nobody was on the bridge, he revved up his hover engine, zzzzzzoom, and set off.
However, he had to brake almost immediately, because another robozoom appeared out of nowhere on the other side of the bridge. This one also flew with a hover engine, and his stunning, yellow armor gleamed brightly in the early afternoon sunlight.
"Hey, I was here first, get out of my way!" the green robozoom shouted, not only because his path was blocked, but also because this other robozoom was decidedly newer than he was.
"Not so fast, old guy!" the yellow one replied. "I can get across in half the time you can! Could you force me to wait for you to pass? Let me go on my way!"