[guiambros]

The key point is to cause pain.

A fine high enough to hurt financially the person breaking the rules is one option (that's what governments usually do). Other good option is public embarrassment. I used the $1 fine for people late to meetings, but we also counted the number of times each one was fined, so there was an extra incentive to avoid.

[DanBC]

Be careful the 'fine' (preventative) does not become a 'charge' (entitlement).

"I've paid my dollar, so what if I'm late?" (As mentioned in that pop-economics book about the parents and the nursery.)