For instance, if I need to return a library book, I put it in my van. If I can't get out to the van, I at least set it by the door.
If I need to email someone, I usually try to do it at that moment. Or I quickly send myself an email to remind myself.
Putting things off leads to me feeling like I have forgotten everything. But doing it at that moment seems to help me keep things moving int he right direction!
P.S. have a K.I.S.S idea? Please email them to me at email@example.com!