I have been obsessed with the idea of flipping a tandem ever since Juvi-Kyle brought up the idea a long time ago. Every time I see a tandem, I imagine how it could be flipped. A lot I'm convinced are unflippable in their current state: Old beach-cruiser tandems with just a coaster brake, brakeless track tandems, etc. The only way to flip those would be to hit something with enough force to stop you, and the front wheels aren't strong enough to transmit all your forward momentum into torque about the front wheel.

But at last, I found it. The ultimate flipping tandem:

More info here.

Why is it the ultimate? Dual 180mm (or even 200mm) disc brakes on the front wheel. Long travel fork. And super-strong wheels. I so want to flip this thing.