Prickly stingy plant

This plant does sting when touched. I tried to use some as shoe cleaner while going to the cementary for the Easter supra as it was in a village, muddy, raining and everyone is obsessed with clean shoes here. I found grass works well without getting hands dirty. In case you are ever lost in the forest and needing toilet paper or want to pick leaves for some other crazy reason, remember not to choose this one.