it was in the fourth quarter. >> announcer: staubach really took a shot. even remembered specific images from the broadcast. >> petrella: i remember staubach just sitting on the bench. >> announcer: here's roger now being worked on over there. >> petrella: you could just tell he was out of it. >> announcer: he probably has a concussion. >> stahl: how about november 11, 1990? >> petrella: they didn't play. that was a bye. >> stahl: ( laughter ) you're good. that was a trick question. ( laughter ) >> petrella: no, i re... i remember that day because... >> stahl: that is good. >> petrella: ...i was... i was depressed. i had broken up with this woman. and i was going out to... to rent a couple videos. and i was thinking about her. >> cahill: there's a quote that i love. it's by the great psychologist william james. he said, "if we remembered everything, we should, on most occasions, be as ill off as if we remembered nothing." >> stahl: and that's what the field of memory has always considered a given-- that a healthy dose of forgetting is crucial to our abilit