First, being comfortable eating alone in a public space should be on everyone's personal to-do list. Second, we're not saying you can't take a friend or two along to Ninja Spinning Sushi; we're just saying that if you really want to get the most out of the experience, you should try it alone. Also, if you're not eating alone by choice, Ninja — run by the same group that owns Yakitori Sake House in Royal Palm Place — is the perfect spot, because there's none of that dead, stare-off-into-space or pretend-to-play-with-my-phone-so-I'm-not-awkwardly-sitting-here-alone time. That's because, at a spinning sushi bar, your participation is required. If you're unfamiliar with the concept, "kaiten zushi" is a revolving sushi bar where different-colored small plates run past you on a conveyor belt or — as in the case of Ninja in Boca Raton — on little boats in a stream. The different colors of the plates indicate the cost of the item you are grabbing. Each plate is like Japanese tapas, containing a few pieces of sashimi or a roll or a little pile of seaweed or squid salad. At the end of the meal, your stack of empty plates is tallied up and you pay your bill. Since this requires some attention and a lot of facing forward at a bar, you can see why it would lend itself to solo dining. And since you're dining alone anyway, might as well stuff your face by taking advantage of the nightly happy hour from 4:30 to 7 p.m. and after 10 when select drinks are priced two-for-one and all the plates cost $3.