A third wheel is an easy way to add an element of stability to a vehicle or an element of mystery to a game of footsie. Harness the power of three with today's Groupon: for $135, you get an eight-hour Can-Am Spyder rental from Spyder-Rentals.com in Oakland (up to a $275 value). Renters must present a valid driver's license as well as a major credit card for incidentals and must sign a waiver. Insurance is required, but a temporary insurance binder (an additional fee of $30+) is offered based on each renter's driving record.

Spyder-Rentals.com gives riders the one-of-a-kind vehicular experience of cruising sunny byways astride the sleek and stylish Can-Am Spyder, a three-wheeled wonder said to be capable of reaching 60 miles per hour in just four seconds. Each zoom-ready rental allows for up to 200 miles and free passage through tolls, allowing riders to focus on nothing but the comic bliss of whisking away the helmets of fist-shaking unicyclists. Helping maximize the convenience of each rider's speedsperience, Spyder-Rentals.com's amicable staff can deposit and retrieve each vehicle for an additional fee (call for estimate and delivery radius).

Although Spyder-Rentals.com sometimes features a discounted price online, this Groupon still offers the best deal available.