For consistency it'd be 7, if you think thumbs aren't fingers, because you start counting things with zero.
"I miss off the thumbs, obviously, so nothingth finger, first finger, second finger..."
But then if you don't think thumbs are fingers, you probably don't think fish are animals. It's a common delusion it seems. I first came across it in a pub in 1990, before Google. We were playing a drinking game and you had to say a thing on the beat. The category this time was animals. I said trout. Everyone was like "fish aren't animals". Only one other person agreed that fish were animals. I tried to make them see. I appealed to science. I appealed to common sense. I even sang a Frank Sinatra lyric to them. But they wouldn't shift.
And the thing is, I've told that story since and people always say "But fish *aren't* animals".
It's like I'm in a weird dream.