The How I Met Your Mother star turns 40 today, which means Doogie Howser MD is now closer to retirement than smug, child genius quack. Think on that.\r<br>\r<br>The top 10 Barney Stinson quotes. How I Met Your Mother.\r<br>\r<br>Here are some great Barney moments.\r<br>\r<br>\r<br>\r<br>\r<br>\r<br>
