I'll add some of my own anecdotal observations.
During the tech boom, just about everyone I knew owned tech stocks. It was a frequent topic of discussion.
During the housing boom, many of my friends and relatives bought homes and we frequently discussed the rising home values. We were not speculators, we were just at that right age to buy a home, late twenties to mid thirties. Luckily, we all bought prior to 2004, so we didn't hit peak.
Three years ago, I was telling my friends that the days of bubbles are over, that maybe gold may be a good investment. That maybe all this wealth we see around us is illusory and credit bubbles do not end well.
They all thought I was nuts. None of them, aside from their wedding bands and wive's jewelry, own gold. Out of 30-40 people I can think of, NONE OWN GOLD. And most still think this is a short term recession.
Another story:
I recently visited my parents. Previously, my mother said that she noticed a cash for gold kiosk opened at the local mall. She had an old bracelet that was scratched, so she asked for a quote. They said they would give her $200.00 for it. She didn't need the money, was just curious, and declined to sell it.
I remembered that story so I brought a stamp scale the next time I visited my parents. I asked to look at that bracelet. It was 18K gold, which is 75% gold content. I weighed it at 1.1 oz.
Melt value of that bracelet was at least $800.00. Remember, they offered her $200.00