I unleashed a bloodcurdling shriek in the theater when he appeared onscreen, because I had just been playing Exile that weekend and was a little high-strung after having been murdered. You know how it is. ;)

The Voyager episode (there are a couple of others with him I have yet to see) and Resurrection are some of his most magnificently creepy, because in both he plays the role of a sort of soulfully evil character with a lot of philosophies that boil down to an aesthetic appreciation of the Dark Side. Anybody who could say a line like "You are a beautiful, beautiful butterfly" to the horrible THING that proceeds to bite his head off (and I'm not talking about Sigourney here) and make it work wins at acting.

As for other Creepy Crushes, I am likewise glad to know I'm not the only one with a list.