It's good you remembered! That happens to me too, sometimes; I do something and a dream suddenly comes to my mind.

- You can do something as basic as summoning a person. Turn around and expect them to be behind you.
- Tell the person they're dreaming.
- Drive that awesome Ferrari sitting in your driveway. You had "bought it a while ago", remember?

It's midnight here and I have to get up in six hours... I can't sleep though. That's all the ideas I have right now. xD