(feel free to add your own)
 
I used to say this one as a kid...who knew I �d become a teacher...
-   
- Joy to the world, the school burned down 
- And all the teachers died 
- The principal is dead 
- We shot him in the head 
- The janitor is gone 
- We flushed him down the john 
- And heeeeaven, the school burned down.
another classic....
Jingle Bells
Batman Smells
Robin Laid an Egg
The Batmobile Lost a Wheel
And Joker got away
 
 
AND one that I just discovered...and thought it was funny
 
Oh, Calculus; Oh, Calculus, 
How tough are both your branches. 
Oh, Calculus; Oh, Calculus, 
To pass, what are my chances
Derivatives I cannot take, 
At integrals my fingers shake. 
Oh, Calculus; Oh, Calculus, 
How tough are both your branches. 
Oh, Calculus; Oh, Calculus, 
Your theorems I can �t master. 
Oh, Calculus; Oh, Calculus, 
My proofs are a disaster. 
You pull a trick out of the air, 
Or find a reason, God knows where. 
Oh, Calculus; Oh, Calculus, 
Your theorems I can �t master. 
Oh, Calculus; Oh, Calculus, 
Your problems do distress me. 
Oh, Calculus; Oh, Calculus, 
Related rates depress me. 
I walk toward lampposts in my sleep, 
And running water makes me weep. 
Oh, Calculus; Oh, Calculus, 
Your problems do distress me. 
Oh, Calculus; Oh, Calculus, 
My limit I am reaching. 
Oh, Calculus; Oh, Calculus, 
For mercy I �m beseeching. 
my grades do not approach a B, 
They �re just an epsilon from D. 
Oh, Calculus; Oh, Calculus, 
My limit I am reaching.
HAPPY HOLIDAYS EVERYONE!!! 