I have had a points system with colleagues for many years now. Basically, if you can show a colleague some a trick, that they will likely use, you score a point.

The nice thing about it is that I've never totted up the points anyone scores. Scoring a point is a satisfaction in itself.

And today a colleague scored a point: 

watch -d -n20 df -h .

Will run  df -h every 20 seconds. And even better, it highlights what has changed since last time.

Very useful.