Yeah, I've done this. Seems to always happen at the worst times possible, too. During a meeting.. At the movies.. When trying your hardest to take a quick sip of something without waking up your wife.. As a school kid in front of your friends at lunch.. Ugh!
I know I've posted a bunch of stereograms before, but I also know for certain that I haven't told you about this collection of stereograms. Waterfall, above, is one of the best ones I've ever seen, and is from 3Dimka on DeviantART.