smile (n.) the shortest distance between 2 people (Anon)

http://www.boreme.com/boreme/funny-2006/laughing-babies-p1.php

'The best smile of all is a baby's smile. It has no guile or calculation. It is pure joy."
Pam Brown, B. 1928

Now if that doesn't cheer up your day you've got a heart colder than Scrooge's under crackers.