One of Jim Powers' directorial trademarks is humor. And in School Bus Girls 4, there is no shortage of funny situations or quips that eventually lead to two people having sex. But the sex, for the most part, is basically run-of-the-mill one-on-one fare with just a little bit of extra umph during the blowjobs.

School Bus Girls 4 revolves around a short bus, that infamous little bus to haul retarded school kids. Desire and Kat take after school classes and are forced to ride the short bus home - since it is the only means of transportation the school has available at that time. And semi-retarded bus driver Otto Bauer is convinced that the two girls getting on his bus are 100% Grade A certified retards. Well, he's practically a Forrest Gump himself, and when the bus starts giving him trouble, he has to pull it into Buster Good's mechanic shop.

While Desire goes to make a phone call, Otto puts the moves on Kat. Buster spies them through the window and beats off until Desire catches him and finds herself turned on by the mechanic with his tool in his hand.

But perhaps the funniest moment of the flick is when Dave Hardman finds Kayla smoking in the short bus. He is appalled that she would be fouling the air of such a fine vehicle as the Pandora 350.

Customers who dig the schoolgirl thing will find plenty to like in this video as Powers does a decent job of tuning in on the little hair-twirling antics of 18-year-old girls.