At 10 'til 5 I ordered pizza online from Domino's (as it's just up the street and they have this special...) for carry out and thought 'I have about 10 minutes to kill I will just read some of this KMeme fill*"
Well, I got the the end (the current end - it's supposedly not done yet) and closed the tab. At this point, the Domino's tab became visible. Cue panicked look at clock. 6! OOOOOPS!
That's embarrassing and amusing enough, but I am wearing my 'I can stop anytime I want to' shirt**, which makes the irony kind of strong, too.
*This one, in fact http://dragonage-kink.livejournal.com/4251.html?thread=10830235#t10830235
** A drawing of a person with their head in "Shards of Honor" and surrounded by other book by Lois McMaster Bujold.