An Intelligent Blonde

A blonde stopped at a gas station, got out of the car, opened the hood, and checked the engine oil. After a few seconds of what appeared to be intelligent thinking she took the dipstick in her hand and walked over to the attendant.

"Excuse me," she said, "but can I buy a longer dipstick?"

"Sure, ma'am, of course.

Why do you need a longer one?"

"Because this one isn't long enough to reach the oil."