While I was working at Wendy's in 97 or so, my boss made me go clean out the toilet, which had become clogged (probably from him, now that I think about it). Since it was so slow then, the front line girl (who made a habit of getting in everyone's business) followed me into the men's room. The toilet was indeed clogged well with liquidy shit and looked about 4 inches higher than usual. My friend came in after 5 minutes of us looking at it in disgust, wondering what was going on. We all just looked at it waiting for the other one to put the plunger in there and start pushing. It smelled FOUL in that bowl, for sure. Finally the girl grabbed the plunger from me and says, "Fine, you babies. I'LL do it!" She put the plunger in place and pushes; we all hear a "wawomp!" plunger sound. My buddy and I back up a step just as she pulls back on the plunger, quite a bit more forcefully than you're supposed to. A big geyser of feces splashes straight up as she leaned over the bowl and hit her straight in the face. My buddy and I look at each other in shock and then to her, who just stands motionless for about 3 or 4 seconds and then all 3 of us start SCREAMING simultaneously. We all bolt out of the men's room, and back through the front line (which is now serving a customer), us two guys in front and the girl, still holding the dripping plunger, coated from the neck up in shit.
The boss saw us in the breakroom and let her have the day off. We two still had to finish the shift (and replunge the toilet).