I was out with my daughter on our coasters today and we stopped to visit a garage sale. I found a fantastic ladderback chair, and quickly converted my Huffy Coaster to a singlespeed tandem -- and the pilot doesn't even have to pedal! Plus, as you can see below, there's still lots of room for food in the trunk (basket).
I haven't been able to find a 'partner' yet to ride with. I did get my daughter to snap a few pics with my Canon A60.
(I really did buy this chair for $5, and brought it home, as well as a set of four water glasses, $1, in the basket. Got a lot of strange looks and not a few outright belly laughs from peds!)