眼の前で停止したのなら「乗れ」ってことでしょう！
いい高さだったし！
良い子のみんなは乗っちゃダメだぞ！

低速走行で通過するときも、飛び乗る妄想をよくします(笑)

When it stops right in front of you, it's practically saying, "Get on!" right?! And it was just at the right height! All you good kids, don't you be getting on these things!

I often have fantasies about leaping on board when there's one passing by at slow speed, too. :-)