Weeping Woman Puns

It turns out she's locked her keys in the car.

"Simple," says the soldier and drops his trousers, takes them off, rolls them into a ball and rubs them on the door.

The door pops open.

"How did you do that?!" exclaimed the young woman.

"Easy," says the soldier, "These are my khakis."

Edit: in the UK 'khaki' doesn't rhyme with 'whacky'; 'khaki' and 'car key' are pronounced the same.

Edit 2: I'm rightly bring criticised by fellow Brits for assuming that my pronunciation speaks for the whole island. In my bit of the UK, a southern enclave in the North, we pronounce it like that.