Use a randomizer to choose someone in your address book and call them immediately (don't give yourself enough time to talk yourself out of it). It is a rush thinking about what to say as the phone is ringing. You are risking your social status (by coming off wierd or awkward, in the case you don't have anything sensible to say) without really harming anyone. On the plus side, you may make a new ally or rekindle an old relationship.