Whether you're nursing a wee bit of a headache on this day after St. Patrick's Day, or you're making life difficult for someone who is, I think you'll find this time-lapse video of the Chicago River being dyed a festive green to be pretty cool.

No truth to the rumor that pollution, contaminates, dumped ballot boxes, and other unsavory items keep the river green all the time, and that the city dyes it a natural color 11 months of the year before letting it revert to its default color of green in March.

Have a look:

And, check out Redeye Chicago's cool infographic on what goes in to turning the river green by clicking here.