ha! fear is a strong motivator. I was once jogging in a part of the park that was closed for stupid reasons (I think a concert was being set up for the weekend) and it was the middle of the night. Some rent-a-cops started shouting at me to turn back and I heard them, but I felt as though I had plausible deniability with my headphones. I knew they were chasing me, and my pace increased a great deal during those 2km or so. Of course these were night shift security guards so they were fat and probably not all that motivated to actually catch me but the motivation was there on my part. Thankfully the real cops never responded and if the rentacops even called them the response was probably "you know we have real crime in this city right? sit your fat ass back down and call us again once he starts stabbing someone"