People-watching games are fun.
They can be very innocent, like a sort of "I spy" -- find someone wearing a Yankees shirt, or someone with pink sneakers.
Or they can be more sinister.... someone who is clearly sporting a toupee, or someone who looks like they just rolled out of bed and decided to spend the day at WDW, or the woman with the most uncomfortable-looking footwear.
Both versions are fun; it all just depends on what kind of group you're with. Now that I have kids, we play the more innocent type; back when we were younger, Mr. Eagle and I opted for the more sinister variety.