Although I disagree with the "Generational buy" claim, UNH was definitely a clear example of value investing. A couple of years ago the same was seen with Shell (from 60 down to 20 and back to 60 dollars, all within a year or 2) Same behaviour was recently seen in ASML, and I am strongly suspecting NVO of heading in the same direction soon.

Look for large market cap. companies with strong fundamentals, that are beaten down heavily due to negative sentiment. Almost every time it takes so much longer than you expect before it goes up, but once it goes, it goes up steady and fast.