What is the largest number that can be made with 2 digits?

Here’s a fun bit to show a library patron, or an audience while they are waiting for a program to begin. Ask your audience if they can make a pear disappear.  Let them think about this.  After a minute or two, show them the secret: 

Professor Wordsmith says that the letter that comes right after AB in the alphabet is E.  How can this be?

It’s back to school time, so here is an interesting literacy puzzler.  What is unusual about these 3 sentences?  Do you know what they are called? Both fickle dwarves jinx my pig quiz. Quick fox jumps nightly above wizard. Five quacking zephyrs jolt my wax bed.