TEACHER:                   Why are you late?
                  
STUDENT:                   Class started before I got here.
                  
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TEACHER:                   John, why are you doing your math multiplication on the floor?
                  
JOHN:                   You told me to do it without using tables.
                  
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TEACHER:                   Glenn, how do you spell 'crocodile?'
                  
GLENN:                   K-R-O-K-O-D-I-A-L'
                  
TEACHER:                   No, that's wrong
                  
GLENN:                   Maybe it is wrong, but you asked me how I spell it.
                  
                  
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TEACHER:                   Donald, what is the chemical formula for  water?
                  
DONALD:                   H I J K L M N O.
                  
TEACHER:                   What are you talking about?
                  
DONALD:                   Yesterday you said it's H to O.