Two pairs of Trac Ball rackets
I'd never played it before, but my friend Heather's husband had brought it to a BBQ she was having, and man it was so fun. I was just having a blast throwing it back and forth. I had no idea a big part of it was that you can easily put spin on the ball, doing all kinds of neat things. Here's an exemplary video of such possibilities, featuring two rotund men on a beach in Florida.