To fool or be fooled?

Yesterday was April 1st  or April fool's day. Who havent  pull a prank or been subject to one on that particular day?  I know I had fallen victim many a times during my school days and of course I did pull one or two myself. It's all fine when we were kids. I wonder if it will still be funny when do do such stuff as adult? Just wondering..
 Yesterday a facebook friend set her birthday   as 1st         April and of course got many wishes from friends and later on she anounced it was not her birthday, and had a good laugh at the expense of her friends.I never expect it to be  she should fake her birthday, because I actually have friends who were born on Aril 1st.
Anyway from the comments on her wall, not many took it too well,me included. I mean there there are things that are sacred. Of course this is just my opinion. What are your thoughts?