Stallking
The act of looking under the stall next to you in the restroom to see the shoes of the person sitting there, possibly to borrow some toilet paper, to engage in an etiquette taboo conversation, or to get the other section of the bathroom newspaper.
“Hi Bob - I knew it was you - I can see your orange Nike’s - you got the sports section over there? Sorry for stallking you, but I am stuck with the entertainment section..,”