Your topics can run the gauntlet of any and all subjects, and most often does, and it will likely be unwillingly shared with anyone and everyone around you. No worries though! Those who give you strange looks either know you and are not surprised but can't help their faces auto-reactions or perhaps they figure if they awkwardly acknowledge you perhaps you'll bypass them quickly knowing they are not "allowed" to stay and enjoy the frivolities of your lunch time public antics. And then there are the strangers. So horrified by you and your, apparently hilarious (at least to you and your com-padres) subjects, they will quietly avert their eyes, stuffing their faces as fast as possible in order to exit quickly in the hopes that your conversation cooties and infectious screeching laughter should not somehow spread to them. Oh, and lets not forget those that are like minded and behaved and gravitate to your group and adds to the raucous and stranger-unapproved behavior and topics.
I shout out to you my fellow Lunchables! We Rock On!!!