The 2600 prank was very lame, but I think more of the focus was on the Off the Hook show prank. That whole thing was amazingly trippy. You do not even need drugs to feel how trippy it is.
Anyhow, I always figured that the way PLA celebrated April Fools day is by NOT CELEBRATING IT.
Think about it. 364 days a year we fool people. So April 1st should be our day of rest.
"And the Red Box Chilipepper saidith on Fools Day, Fuckith Thou Phone Pranks, Thy Needith A Sandmitch!" -- Cactus, 13:37