Being neighbourly

I knocked on my neighbour's door earlier and said, "Sorry to be cheeky, but do you mind if I use your bathroom? Mine's out of order at the moment."

"Not at all, come on in," he laughed.

About twenty minutes later he knocked on the door and said, "Uh, are you all right in there?"

I replied, "I'm fine.

Spoiler:

You need to buy more Radox, by the way."