World's Raddest Tandem!
Martin Wendt has designed a tandem prototype that is based off the extremely rare KOS Kruiser Tandem but it features a new innovation: the stoker (the rear rider) has two bottom brackets - one for children and the other for adults!
If you want one, contact mongoose for details!
The blank bottom bracket is for when your kiddos get bigger! Notice the double dual bottom bracket in the back (three bottom brackets in total).
More pics at the museum: http://bmxmuseum.com/forums/viewtopic.php?id=374325