Aha! I know this one! So there!!!*Plumps up chest and looks all smug*
Willow calls Xander Mr Stealthypants, because he calls out to Captain Cardboard about the choo-choo signal he made in ... In ... an episode of Buffy. I remember, 'cause I saw it - wait, let me check ... Okay, it's in *squeezes eyes shut and concentrates* Shadow ... or Listening To Fear, or, um ... One about then, I think.
I was wondering something about the Joo Janta 200 Super-Chromatic Peril Sensitive Sunglasses - if the peril was, say, walking into a lamp post, or a brick wall, would they go black? Because, if they went black, you would walk into said wall or post, thus perilisating (it is a word, I tell you!) yourself, whereas, in fact, if you weren't wearing them at all, you'd see the wall, and wouldn't walk into it in the first place. And if that was the case, would they still turn black while in your pocket, or only if they were on your face ...? Um, I'm reading too much Hitch Hikers, aren't I?
*Walks off, forgetting to remove his glasses, and promtly walks into the door frame*
Ow!