Every April 1, Google usually has a clever April Fools prank on their main search page. No matter how common this knowledge is, or how obvious that it's April Fools day, Google seems to get loads of complaints every year.
One year they had a whole section about how trained pigeons pecking at a keyboard are the key to their search results. Another year they announced that they were hiring for a new complex they were building on the moon (believe it or not, apparently they got more resumes than they reasonably should have).
This year, it's Google Romance