Here's an ill-advised HOWTO from Instructables user Lemonie that shows you how to turn your useless VCR into an incredibly dangerous toaster:
How to make a VHS video toaster (via OhGizmo)
If I thought anyone would attempt this (and they shouldn't) I'd offer the following warnings:
Ensure the metal parts are earthed (I did)
Do not place it on heat-sensitive surfaces.
Do not place heat-sensitive materials on top of it.
Take care not to touch any hot surfaces.
Do not leave the machine unattended.