Great idea to use: http://www.writingfix.com/Chapter_Book_Prompts/Twits3.htm
Then read the revised version: My teacher got a rip in his pants. He got one of those oh-my-gosh-my-pants-have-a-rip-right-in-the-you-know-where-and-what-do-I-do-now looks on his face as they pulled completely apart at the seam. Our whole class watched in breathless anticipation of what would happen next. It was dead silent for at least a count of 5. Then Ramon yelled - “Hey Mr. Foster - let ‘er rip!” Everyone burst into laughter; you could hear it echoing off the wall into the other classrooms. Everyone, that is, except me. I was just too embarrassed for Mr. Foster to do anything but grin and let out a nervous giggle. He caught my eye and smiled back – I guess that made it OK, because then everyone started realizing how awkward it was and began looking for ways to help. Somebody went to the office for the secretary, and several kids kept saying, “Don’t worry, Mr. Foster. It will be OK,” but then they’d start to look at each other and laugh again. Pretty soon the secretary and principal came in and Mr. Foster went home to change. When he came back about an hour later he was smiling kinda sheepishly. He didn’t say too much about what had happened and before long he seemed like his old self. But I kept wondering if this was one of those times he would remember and tell classes in the years to come about the day he got a rip in his pants!