TRIP WITH THE TEACHER (1975)
http://www.imdb.com/title/tt0070834/
A pretty young teacher named Miss Tenny takes four of her sexiest young pieces of jailbait on a field trip into the desert. The bus breaks down along the way and Marvin, the quite possibly retarded bus driver is completely baffled by the situation. Tension reaches a boiling point and a couple of the skanks begin wrestling each other, much to the delight of Marvin (and the viewer!). Then things take a turn for the worse when a trio of bikers show up to "save the day."

One of the bikers is actually a genuinely nice guy named Jay. We know Jay is a genuinely nice guy because we already saw him lend a hand to the other two guys he's riding with. Unfortunately for everyone involved, the other two guys happen to be a pair of drugged out, psychotic, rape happy brothers named Al & Pete. Al is your standard issue David Hess type. Pete is the classic whimpering sidekick who spends a lot of time slobbering drunk.

It doesn't take long before a fight breaks out between Al and the (short) bus driver. Marvin uses his mongoloid strength to knock Al down, but the psychos get the upper hand thanks to a little motorcycle mayhem. Al runs Marvin over with his bike and breaks Marvin's neck in the process. Pete then freaks out and in a panic the brothers take off. While the helpless women and tender hearted Jay fiddle around for a while trying to figure out what to do next, Al & Pete decide to go back to the bus and have some fun before killing everyone.

After making short work of Jay, Al & Pete begin having their way with the scanitly clad girls. Miss Tenny watches helplessly as the thugs savage her students. One by one, the girls and the teacher are humilated, beaten, and raped by the seemingly insatiable brothers. One unlucky gal gets her face pushed into mud until she chokes to death. After hours of bondage and brutality, Jay finally manages to free himself and convince Miss Tenny and her students to fight back. The teacher hesitatingly agrees and begins to learn a lesson in revenge.

I really enjoyed this sleazy little rape & revenge flick from writer/director Earl Barton. The ads for this one screamed "How far should a teacher go to protect her students?" It's amazing how much time the teacher spends sitting around watching her students get raped. The thought of defending herself or her students never crosses her mind. She never tries to escape either. The girls are equally dimwitted and miss multiple chances to run away when left alone.

I wouldn't put "Trip With The Teacher" in the same league as classic revenge flicks like "Last House On The Left" or "Death Weekend," but it's definitely worth a look for sick fucks (myself proudly included!) who crave this sort of thing. You can get this flick on dvd in the Drive-In Cult Classics 8 Movie Collection. For less than $10 this a steal.
