It's almost second-nature for me to say "That I cannot do" when someone asks me a favor, whether I can do it or not.
"Growing up my dad was like 'You have a great last name, Galifianakis. Galifianakis...begins with a gal...and ends with a kiss...' I'm like that's great dad, can we get it changed to 'Galifianafuck' please?" -- Zach Galifianakis
