There is something about tap that makes it great fun to watch — maybe it's the skill that it takes to control the body on such minute levels; maybe it's the happy clicking sound, or the syncopation.
For advice on how to be happier, click here and here.
For the rest of the top 10 – and how the principles have been applied by some famously happy people – click through the gallery (or read on below).
Today's big environmental groups recruit through direct mail and the media, filling their rosters with millions of people who are happy to click "Like" on clean air.
I then decided to have a 'frog portrait' session as it was too good a chance to miss and managed to capture this happy fellow!" Click or tap the image below to view a larger version, alternatively you can see Wendy's original image on Flickr.
Click, click, click, click, click.
A year passed in a blur of stupid jobs — for Lance, stints driving a cab, delivering flowers, and, for Kirsten, tearing movie tickets in half as a stream of happy dreamers clicked through the turnstiles, then sweeping debris from the floors in the dead-still hours when the decent world slept.
For more tips and hints on living a healthier, wealthier, happier life, click The Wealth Book - Winning With Spirit.
The promotion, which was available in every city, briefly crashed Groupon's servers as deal-happy consumers clicked on the 50% discount and pinged their friends.
