A man turns 90 and heads to the doctor for his annual check-up.

After his exam, the doctor says,

"For a man your age, you're remarkable; in fact, you're in the best shape I've ever seen for someone of your advancing years."

The old man smiles proudly.

"Well, Doc, it comes from good, clean living. I know for certain I live a good, clean, spiritual life."

The doctor raises an eyebrow.

"Oh? And what makes you say that?"

The old man winks.

"If I didn't live a good, clean life, the Good Lord wouldn't turn the bathroom light on for me every time I get up in the middle of the night."

The doctor looks concerned.

"You mean... whenever you get up to use the bathroom, the Lord Himself turns the light on for you?"

"Yep," the old man replies confidently. "Every single night."

A few days later, the old man's wife comes in for her own check-up. The doctor feels he should mention it.

"Your husband is in fantastic physical shape," the doctor says, "but I'm a little concerned about his mental state.

He told me that every night when he gets up to use the bathroom, the Good Lord turns the light on for him.

She stares at him.

"He WHAT?"

The doctor repeats himself.

Her eyes go wide, and she throws her hands in the air.

"Aha! So he's the one who's been peeing in the fridge!"