I went to Hulu and watched the 20/20 tribute to Regis Philbin since I didn't know ABC was going to air such a show till I found out too late by watching "Extra" at 1:05 AM CT.  When they got around to WWTBAM, they said it was the first game show ever to offer a million-dollar prize.  Evidently, they either forgot about--or never heard of--The $1,000,000 Chance of a Lifetime with Jim Lange.