This was extremely common on 4chan maybe 7 or so years back I can't remember the exact year and it worked for a very long time before anything was done about it

This was extremely common on 4chan maybe 7 or so years back I can't remember the exact year and it worked for a very long time before anything was done about it and everyone knew to do it. Google asked for two words and presented them as two different fonts. The real word that needed transcribing was always identifiable and you could just write what you wanted as long as you got the second test word correct. Much fun was had.