Grounders is a playground tag game also known to exist in Calgary, Alberta.
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.
haha! Bob just fell down and hurt himself playing grounders!
don't worry, Joe, there's no step in front of you!
*Joe trips over the step*