I've run across a couple of situations in "everyday life" in which it was possible to see obvious diffraction or interference patterns from light. I find that sort of thing delightful -- no fancy equipment, not even a laser pen pointer -- so I wrote them up:

http://physicsinsights.org/interference_1.html

Includes a couple of moderately nice pictures of interference patterns. (Well, I think they're moderately nice, anyway.)

Cheers...

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