you can do the exploding tea jug

yes, I could, except I already did an exploding teapot earlier in the semester.

attach of the killer sewing machine?

might be fun... how would it attack?

an electric vampire

0_O Oh my, my, my. that may be difficult to model, and may take even longer to render. Though it is a fascinating idea.

you can always just have one chasing people

people are difficult to model and render too... Computers at school/home not powerful enough.

stupid computers

my thoughts exactly. They drive me crazy more often than not.