From the Paramount Picture "Papa's Delicate Condition"
Music by Jimmy Van Heusen; Lyrics by Sammy Cahn
Composed for, but not recorded by, Fred Astaire

Call me irresponsible
Call me unreliable
Throw in undependable too

Do my foolish alibis bore you
Well I'm not too clever 
I just adore you

Call me unpredictable
Tell me I'm impractical
Rainbows I'm inclined to pursue

Call me irresponsible
Yes I'm unreliable
But it's undeniably true:
I'm irresponsibly mad for you