As requested by Lorien and Dalene: the prequel to On Golden Pond.
When "Bob" was about 5 or so, he went somewhere with my sister in her minivan. She had given him numerous opportunities to take a bathroom break, none of which he took advantage. After all chances for potty breaks were past, he announced that he had to pee. My sister explained to him that stopping was no longer an option, but he insisted he had to go really bad.
"Well, honey, we just can't stop."
"But I have to go now!"
"Can't you wait?"
"All right. There's a cup back there. Just pee in the cup."
No problem. Except that "Bob" didn't hear "cup." He heard "cup holder."
He filled every one by which he was seated, almost to overflowing.