"I never took acting classes, but I knew I could do it based on the skill with which I lied to my parents on a regular basis!"

This quote by Ryan Reynolds is an amusing way of expressing his confidence in his acting capability. He suggests that his natural talent for acting was refined by his regular practice of lying to his parents. He implies that his ability to trick his moms and dads was an ability that he had established over time, which this ability was transferable to the art of acting. He is recommending that his natural skill for acting was currently present, and that he did not need to take classes to develop his abilities. He is revealing his self-confidence in his own capability to act, and his belief that he could do it with no formal training. This quote is a humorous way of revealing his confidence in his own capability to act, and his belief that he could do it without any official training.