Search Engine Watch Editor Danny Sullivan has rounded up the range of April Fools search-related pranks for your amusement.
There are some very clever and elaborate ones on the list, including:
After careful thought and review of these efforts, I believe there are a number of possible responses:
1) How delightful!
2) These guys have too much time on their hands, or
3) If you're U.S. Rep. Tom DeLay (R-Texas), "The time will come for the men responsible for this to answer for their behavior."