Q: How do you spell mousetrap? A: C-A-T.
What ten letter word starts with g-a-s? Automobile.
Can you spell a pretty girl with two letters? QT
Q: "What letter of the alphabet has got lots of water?" A: "The C"
Q: "What letter of the alphabet is always waiting in order?" A: "The Q. (queue) Q: What begins with T, ends with T and has T in it? A: A teapot.
Q: When I was young there was only 25 letters in the Alphabet? A: Nobody new why.
Q: What is heavy forward but not backward? A: Ton. Q:
Which letters do Tuesday, Thursday, Friday and Saturday have in common? A: None! None of them have "c", "o","m" or "n" in them.
Q: How do you make seven even? A: Remove the 's'
Q: Why can't you find the letter X in Church? A: Because it was X-communicated.
Q: What's the difference between here and there? A: The letter T.
Can your mom's name with two letters? EZ. How can you spell too much with two letters? XS I know 25 letters in the alphabet I don't know Y. Q: What five-letter word becomes shorter when you add two letters to it? A: Short
Q: What is the most important thing a witch needs to learn in school? A: Spelling.
Q: What's the longest word in the dictionary? A: Rubber-band -- because it stretches.
Q: What is at the end of the world? A: The letter 'd'
Can you spell eighty in two letters? A-T.

source: http://www.jokes4us.com/miscellaneousjokes/schooljokes/spellingjokes.html