blame foolishness

Completely lacking forethought or caution.

An utterance used by Tom Sawyer and Huckleberry Finn

Example 1:
Susan: Let's go to the cinema to watch 'P.S. I love you'.

Kevin: That's just blame foolishness

Example 2:
"You don't have to get up, mornings, and you don't have to go to school, and wash, and all that blame foolishness."