I'm not talking about grandmothers' funerals, or the perennial "puking all night" excuses. I would like to know what excuse did you proffer that had some real creativity and/or novelty?
I'll start: I once told my boss that I had a blinding headache, uncontrollable nosebleed, and was slurring my speech. I told him I was going to go to the emergency room. The next day, I said that I had a "suspected mini stroke" but that I was waiting on the results of a test. I am sure that this was easily dismissed hogwash, as strokes are pretty easy to confirm. Lucky for me though my boss at the time was not that sharp.