Chlorophyll's Law

The proximity to deadline or degree of concentration needed for a project is inversely proportional to the number of interruptions you receive while trying to complete said project.

As an example, it took me over an hour to type and send an e-mail that had to get out "right away", but I wasn't interrupted when typing this.

By the way, if this law already has been stated and propagated by anyone else, please let me know, so I can give due credit.