(Bill Anderson)      She came in the door and walked to the bar   And I guess my face turned white   I hadn't seen her in a long time   And I didn't want to see her tonight.      The lady who was sharing the table with me   Said, ''Is that somebody you know?''   I watched as a stranger bought her a drink   And I said, ''You might say so.''      She's a mistake I made when I was twenty-one   I did a lot of crazy things back when I was young   And I've still got her footprints on my heart and on my mind   She's a mistake I made when I was twenty-one   And twenty-four and twenty-eight and twenty-nine.      She thought my heart was a revolving door   She came and went as she pleased   For every night I spent in her arms   I spent two on my knees.      Begging her to stay and live in my world   Needing her desperately   Look up fool in the dictionary   And you'll find a picture of me.      She's a mistake I made when I was twenty-one   I did a lot of crazy things back when I was young   And I've still got her footprints on my heart and on my mind   She's a mistake I made when I was twenty-one   And twenty-four and twenty-eight and twenty-nine.      There's no fool like a young fool   I've heard 'em say   But I'm not sure that I'm mature enough   To walk away even today.      She's a mistake I made when I was twenty-one   I did a lot of crazy things back when I was young   And I've still got her footprints on my heart and on my mind   She's a mistake I made when I was twenty-one   And twenty-four and twenty-eight and twenty-nine...