Turning on one switch by itself turns on a few lights. Turning on the other by itself turns on a few other lights. But then there are a couple lights -- the ones I actually care most about, because they're directly over the sink, and all the other lights are shaded by my body when I'm standing there cleaning out my mug, or whatever -- that only come on if both switches are on.
This is ludicrous. What electrician would do such a thing on purpose? I can only assume that the electrical wiring is actually tracing out Enochian sigils, or eldritch runes. We're working in a building designed by Ivo Shandor. When some Elder God comes bursting out of the basement to devour humanity, immediately before I'm driven mad, and eaten, I'll experience a grim sense of satisfaction at having at least anticipated our collective demise.