For me, it was a mid-2001 flight from Phoenix to Las Vegas. I noticed that nearly everyone was paying very close attention to the safety briefing. The FA wasn't doing anything funny; it was run-of-the-mill. I shrugged my shoulders and went back to reading my magazine.
Since I was sitting near the front, I overheard two FAs talking to each other. One asked the other what was up with everyone paying attention. The other FA told the first one that there was an emergency landing earlier in the day, and everyone had to evacuate. No one was hurt, and it turned out to be a false alarm, but the pilot took no chances. These passengers were finally making it to Las Vegas.
I guess the experience spooked them enough to actually pay attention to the announcements.
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