Sometimes, its best to just mind our own business and keep on trucking.
Otherwise, by doing anything different, we fire up the door to the possibility of trouble!
Whats wrong with making a few bucks on the side?

Back to the Future Part II / Universal Pictures
Marty thinks like a shrewd entrepreneur, though this is sorta illegal.
Since hes in the future, hell know how a whole bunch of sports matches pan out.
However, Marty takes a pause when he sees the size of Griffs baseball bat.
Well, needless to say, Marty still gets his payback in the end.
Where were going, we dont need roads
The time-traveling is just too dangerous.
However, no one quite buys that hell stop his time-traveling shenanigans just yet.
Power laces!
All right
Hey, why does 2015 look so much more advanced in this movie than even now?
How is it possible that no one has invented this yet?!