When you need to remember something but are not able to write a note for yourself, for instance when driving in the car, I have found this little tip to work well. Place something where it really should not be but make it as unusual as possible. Then as you place the object think about the thought you need to remember later.

Then when you finish you’re journey, and look at the out of sync object, you will find that you remember the idea you ‘attached’ to it.