Minor injuries are quite common as a result of navigating the complex surfaces blind. These injuries may result in great humour to the other participants. Often, if one or more people have not yet been "it" or have tried to cheat, the others will gang up on them to put them in a position where they will more likely get caught.
Variations of Grounders include allowing the person who's "it" to have their eyes open while on the ground but closed on the playground area. While on the ground, they can then reach in to try to tag people.
don't worry, Joe, there's no step in front of you!
*Joe trips over the step*
The game usually becomes more fun if the participants are intoxicated on alcohol or marijuana or other things. It is also fun if a member is overweight or typically scared of jumping around or having one's eyes closed on complex surfaces!
Grounders is a game that I only know of existing in Vancouver, British Columbia but may exist elsewhere.