Coffee shops are definitely tougher than bars. I've made friends with baristas in one of three ways: The shop wasn't busy and they had time to chat (these shops don't usually last long), I recognize them outside of the coffee shop and get to say hello, or I worked at the coffee shop with them.

I wonder if Yemeni cafes would be a bit more bar-like in terms of socializing. They're usually open until midnight or later, but I think it'll be a while before they come to where I am in Iowa.

As for the pinball evangelism: I think it's because pinball is a great shortcut for making friends for introverts. The level of structure, competition, socialization, and just about everything else about it can be dialed in to each individual's liking.