You guys do NOT have to spoiler-tag stuff from
commercials.
Really. They're
commercials. Spoiler tags are for concealing stuff contained within a medium not yet released to the public at large; like discussing an ep as soon as its aired on the east coast but before its aired on the west coast, or discussing an ep released on Comcast On Demand (which not everyone has) or online before it aired on TV. (People in other countries know its up to them whether or not to visit an ep discussion thread at all before their country gets the ep.)
I just think people over-use spoiler tags. *shrug*