better collateral required

Reader's Digest 3月号の記事 'Life in These United States' から引用します。
My 35-year-old son and I had just finished our meal when I realized I'd left my wallet in my truck. As I headed out the door, I told the waitress what had happened. "But don't worry," I said with a grin. "I'm leaving my son for collateral."
She looked at him. He winked at her. She turned back to me. "What else you got?"