Here are two games that were mostly invented by a good friend of mine whose name rhymes with Hair-a.
1. The Name Game. You're driving down the street, and you notice something about someone walking on the sidewalk. You point the person out to your friend, and say, "OK. One, two, three," then each of you shouts out what you think the name of the innocent bystander (bywalker) is. Sometimes the names you yell at each other almost sort of match. This is very exciting. Other times the names don't match, but one is clearly much better than the other. The winner earns a small smile of satisfaction at her triumph.
2. The "I can't believe you..." game. For this game you need a straight man. By default I usually play this role. You pull a story from the day's headlines. Page 6 stories are better for this game than leading news stories. Approach your straight man and retell the news story as if your straight man had played the starring role in the story. As in, "Alex, I can't believe you finally decided to support a woman's right to choose, but only when it comes to her light bulb." If you're lucky, the straight-man hasn't read the story and doesn't even realize you're playing a game. Confusion and hilarity ensue.