Collecting Business Rules

Can you give me an example or two of a good business rule? (curious and interesting business rules welcome!)
1 answers

Several examples can be given:

For example, rules that define customer greetings based on the time of day and customer's attributes and calculate vacations days can be found here.

Other business rules can be found: here and here.

Furthermore, I've found a Business Rules Community and a Business Rules Blog which might be interesting for you Chris!