Pay for a plane ticket to visit your brother's new baby, go to your college reunion, throw a Superbowl party.

花钱买一张机票去看望你刚出生的侄子，出席大学同学聚会，或者开一个庆祝超级碗杯的派对。

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That means, if you are going in a plane and you throw something up in the air, it seems to be going up and down to you.

也就是说,如果你在飞机中,你向空中扔出一物体,它也许会相对于你上下运动

耶鲁公开课 - 基础物理课程节选

Within minutes you'll be entering your initials on the high score list and thinking how much more fun it would be to throw this game from a plane, sans chute.

CNN: Skydive: Gonzo goes splat