I have found an obvious and simple way to amuse myself at my psuedo-girlfriend's expense. I use her own fear of ghosts against her. Last night we walked into our humble abode and I stated right away that I smell something funny.
"Do you smell that, Tirak?"
"No, I cannot" (points at her nose)
"It smells like men's cologne mixed with fart"
(Eyes increase 3 sizes) "Are you sure? Don't say that!" (Visibly shivers)
Mind you the house had been locked up tight all day so the obvious answer to the mystery of the odd smell is that there is a ghost. She even had me sniff various objects--the laundry, the trash, so forth--but I insisted the smell was only coming from one area about 1.5 meters off the floor.
It was fun, in an evil sort of way. Now I know what to do when there's nothing on the telly.