My favorite stupid Google April Fools joke was when they put out a "customer" blog post bragging that Contoso had switched to Google Apps.
https://cloud.googleblog.com/2011/04/contoso-has-gone-google...
https://cloud.googleblog.com/2011/04/contoso-has-gone-google...
>2011
Wait, Rebecca Black was that long ago? Feels like yesterday.