It's not weird actually. Peter Lynch would walk around shopping malls and see what people were wearing and buying. The next thing HN downvoters are going to say is that a good business is not necessarily a good investment. However, it's investing in what you know - which is another Peter Lynch idea.
A number of investors, Peter Lynch and Warren Buffett, especially act as if their process is less sophisticated than it is. Sure, maybe Peter Lynch had a few ideas cued up by walking through shopping malls, but the guy could also read a balance sheet.
