Teacher: Why are you doing your multiplication on the floor? Student: You told me not to use tables.

A teacher was giving a lesson on the circulation of the blood. Trying to make the matter clearer, he said: “Now, students, if I stood on my head the blood, as you know, would run into it, and I should turn red in the face.” “Yes, sir,” the boys said. “Then why is it that while I am standing upright in the ordinary position the blood doesn’t run into my feet?” A little fellow shouted, “‘It’s because yer feet ain’t empty.”

A linguistics professor was lecturing to his class one day. "In English," he said, "A double negative forms a positive. In some languages, though, such as Russian, a double negative is still a negative. However, there is no language wherein a double positive can form a negative." A voice from the back of the room piped up, "Yeah, right."

On the first day of college, the Dean addressed the students, pointing out some of the rules. "The female hostel will be prohibited for all male students, and the male dormitory to the female students. Anybody caught breaking this rule will be fined $50 the first time." He continued, "Anybody caught breaking this rule the second time will be fined $100. Being caught a third time will incur a hefty fine of $200. Are there any questions?" At this, a male student in the crowd inquired, "How much for a season pass?"

A gentleman wanders around the campus of a college looking for the library. He approaches a student and asked, “Excuse me, young man. Would you be good enough and tell me where the library is at?” The student, in a very arrogant and belittling tone, replied, “I sorry, sir, but at this school, we are taught never to end a sentence with a preposition!” The gentleman smiled, and in a very apologetic tone replied, “I beg your pardon. Please allow me to rephrase my question. Would you be good enough to tell me where the library is at, asshole?”