Bathroom Monologue: Guys & Logs

They were doing Guys And Dolls that Spring, and rehearsal always went  over. That left Jeff late for Mathematics at least twice a week. Mr. Crabtree left the door open and didn't say a word, always letting him creep into the back of the room. Yet before the end of every class, Mr. Crabtree would draw a new logarithm on the blackboard and "randomly" select Jeff to come up and solve it. After three weeks, he finally stayed after class and asked, "Why do you keep making me do them?" "As an actor," his teacher said, "I thought you could handle a mono-log."