Apple - searching for colloquial or rumored product names (such as iTouch or iTablet) refers you to the appropriate products.
Chrome - When deleting lots of individual items from your history, Chrome suggest trying Incognito mode (which doesn’t record history) in the future.
Make me a Cocktail - If you click on the search button with nothing in the search box, it types out a random cocktail for you to try.
/via Nick Wilkins
Facebook - When it’s your friend’s birthday it suggests you post about it.
Apple ID - Items on the password “must have” list are checked off as you enter your new password.
/via Stephen Lewis