I offer all of ya 2 options to explain this picture Both being quotes:
A)
Jamus:
So tell me hos is it that a man like you ends up all the way out here? without a horse or a hat?...
marty:
and I just forgot my hat. Well, my... horse broke down and a bear ate my boots... and I just forgot my hat.
Jamus:
How could you forget a thing like your hat ?


B:)
You just had to go back for your hat didn't you?
Indy
Yep i like this hat

Option (yes i cheated on this one)
C:)
Sallah: Please — what is always with this "Junior"?
Henry Jones: That's his name: "Henry Jones, Junior."
Indiana Jones: I like "Indiana."
Henry Jones: We named the dog Indiana.
Marcus Brody: May we go home now, please?
Sallah: The dog? You are named after the dog?! [laughs]
Indiana Jones: [grumpily] I've got a lot of fond memories about that dog..

Indiana Jones Shade!