Things that identify a bubble/Top: When G. Gordon Liddy and Pat Boone are on TV telling you to buy gold NOW.
The two most obvious and ominious signs that I ever got: 1) the girl who cut my hair told me that she owned two condos pre-construction and that real estate never goes down. 2) the BrightHouse networks cable TV installer told me that he was a real estate investor and owned 5 newly built homes ... and wanted to buy more. This is not a joke - 100% true! At that time (Florida circa 2006) almost everyone was telling me that I was an idiot for renting and not buying.