The one I bumped into recently: the Coastline Paradox

“The coastline paradox is the counterintuitive observation that the coastline of a landmass does not have a well-defined length. This results from the fractal curve–like properties of coastlines; i.e., the fact that a coastline typically has a fractal dimension.”

A good pair of comfortable shoes for your day-to-day circumstances.

Admittedly, this can easily break the $100 limit depending on where you live, your circumstances, etc. but buy the best pair you can afford.

“continuing to push the boundaries of consent.”

If by “push the boundaries” you meant “completely ignore them”, then yes. This kind of behavior from MS, or any vendor, should always be considered strictly unacceptable.