I usually make small reasonable parlays. But ever week of the nfl season I like to make a 3 to 5 team upset parlay and put 2 on it and then I like to parlay every game of the week and put 1 on it. I've never won either but I've come reasonably close once or twice. It's just fun. As long as your not throwing all your money away its only stupid if you parlay something impossible (like twoteams against each other both winning [the site I bet on will let you do that{I just set it up once to see; I didn't actually make the bet}])