Though we can't live without it, the sun often makes life difficult by blinding motorists or forgetting to turn off its blinker. Send a shaded message to the sun with today's Groupon: for $159, you get a full car or SUV 3M window tint at MoonShadow Window Tinting (a $399 value).

MoonShadow Window Tinting's technicians deftly veil cars and SUVs in UVA-blocking films recommended by the Skin Cancer Foundation. During the tinting treatment, two-door and four-door vehicles receive a snug wrapping of FX HP hybrid films, which fuse two kinds of film to block up to 55% of heat and fight off the sun's glare, or 3M films, nanotechnologically advanced skins comprising more than 200 ultrathin layers of nonmetallic membrane that will neither interfere with electronic devices nor admit belligerent sunbeams. Like cars, the window-tinting treatment comes with a lifetime warranty.