“Please remember what you were about to forget.”
No, Japanese bus companies are not promoting distributed practice, where learning activity is spread out over time to improve overall learning (chapter 4 of The Power of Participation has more on this).
Instead, they are merely reminding people who are getting off the bus to check for anything they may be leaving behind.
Nevertheless, I like the (probably unintended) playful construction of “Please remember what you were about to forget”.
And perhaps, having typed it a few times here, I’m a little more likely to carry it out…