"Indiana Jones" joke

A blonde, a brunette, and a redhead show up for the same job interview. The brunette is the first one to go in, and after filling out the forms and going through the questions, the interviewer decides to ask her last question:
"How many D's are there in "INDIANA JONES?"
The brunette thinks for a second and responds "One."
The interviewer sends her back with a promise that he'll get back to her after he had interviewed the remaining candidates.
The redhead is next. The process goes about the same, and at the end: "How many D's are there in INDIANA JONES?"
She immediately says "One." The interviewer says, "OK, we'll let you know."
Then the blonde comes into the room, goes through the questions, and finally gets asked: "How many D's are there in INDIANA JONES?"
She gets a very serious look on her face and starts counting her fingers, muttering: "2, 4, 6...., hmmm? wait,... 2, 4, 6... can I borrow your calculator please?"
After going through 15 minutes of intense calculating, she finally comes up with the answer: "Thirty two"
The interviewer is stunned and asks her: "Ok, now tell me, how the hell did you arrive at this answer?"
"Simple... Daaaa da da daaaa daaaa da daaaa... Daaaa da da daaa daa da daaaa da da... sing along now you remember it"