I rode with some professional cyclists a couple of times for warm ups many years ago. These guys know how to ride bikes. I rode with a track racer who would lean on your shoulder while riding next to you or would grab your shorts when passing you going 5 mph faster than you. He would yell out "madison" and stretch your shorts almost to your handlebars before sending you flying past him.
I was thankful to be invited on the ride and was pretty stoked to get tips and learn how to behave in a pack. I am pretty solid till I get tired.