Apart from the Spelling?
Fel-osophy
Because warlocks have hollow weenies!
With a warlock.
Ooops... wrong sub.
They can stick to the subject!
The University of Minnesoda
Can I have fries with that please?
Because he has a hollow-weenie
Because her husband had a hollow weenie
A flat miner. EDIT: spelling
Spoopify
To keep their hats pointed.
How do you get a witch pregnant?
The Necronomnomnomicon.
If you leave a yogurt for 200 years it'll grow a culture.
There's a vas deferens.
A wizard is never late.
He was going as a banana.