Learn A Phrase: To pull someone's leg

Meowzilla shared a post on the interesting behavior "tail pulling" of the crow and some other birds. Quite funny. Related to this, do you know what it means to "pull someone's leg"? If you need the definition and a brief history of its origin, try this one:

http://www.onestopenglish.com/community/your-english/phrase-of-the-week/phrase-of-the-week-to-pull-someones-leg/145670.article

S.D
2014.6.1