Back in the mid-1960s, Gretsch built and sold about 75 Bikini guitars, a short-lived experimental instrument with interchangeable necks and bodies (bass and guitar necks and pickups assembled on a tiny, two-by-four body designed to slide into kitchen-drawer-like channels in single-neck or double-neck slab bodies, with the bodies hinged down the middle so that both bodies and both necks could fit in a case with standard dimensions).
A Gretsch Bikini in action:
Lovin that drummer's style