just look at marilu henner's closet. >> henner: i like my shoes a certain way-- right shoe going thisve the exact same hangers because then everything slides more easily. >> stahl: and bob has a few obsessions of his own-- if he drops his keys on the ground, he feels compelled to wash them. but mcgaugh says bob is the only subject he knows of who has used his extraordinary memory to create a fantasy world. >> mcgaugh: i guess you could say that the fantasy basketball team is another form of obsession. but, you know, we use the word "obsession" as being, "oh, that's terrible, this person is obsessive." well, that's not all bad. in some sense, it's a good idea to avoid germs. in some sense, it's a good idea to have an imaginary basketball team because it doesn't cost anything and it's a lot of fun. >> stahl: the fun started more than 50 years ago when bob was in junior high, and a devoted fan of his local high school football team in beaver falls, pennsylvania. they had gone undefeated for two full seasons. so when they finally lost, bob was devastated. his solution-- create a fictional

they think it's autistic. >> stahl: yeah. >> petrella: call you "rain ( laughter ) >> marilu henner:> petrella: and i'll just go along with that. "yeah, yeah, definitely friday." >> stahl: the mystery is they're not autistic. they lead normal lives. but dr. mcgaugh says the one thing they have in common is obsessiveness. just look at marilu henner's closet. >> henner: i like my shoes a certain way-- right shoe going this way, left shoe going that way. and i have the exact same hangers because then everything slides more easily. >> stahl: and bob has a few obsessions of his own-- if he drops his keys on the ground, he feels compelled to wash them. but mcgaugh says bob is the only subject he knows of who has used his extraordinary memory to create a fantasy world. >> mcgaugh: i guess you could say that the fantasy basketball team is another form of obsession. but, you know, we use the word "obsession" as being, "oh, that's terrible, this person is obsessive." well, that's not all bad. in some sense, it's a good idea to avoid germs. in some sense, it's a good idea to have an imaginary b