Example 1
Friend 1: I'M DROPPING EVERYTHING TO GO TO THE MIDNIGHT PREMIERE OF HARRY POTTER AND THE DEATHLY HALLOWS TONIGHT!!
Friend 2: You are such a Harry Potthead.
Example 2:
Girlfriend: Hey, I'm really in the mood tonight, if you know what I mean...
Boyfriend: Not now, I'm watching all of the previous 6 Harry Potter movies before the new one opens!
Girlfriend: Why am I dating a Harry Potthead??