and you might remember him like this
or like this
or maybe like this
so, sorry I recorded this wrong but I don't think you'll believe his right arm.
Here's the dialogue from the movie.
What's wrong with his fin? TAD
He looks funny! BOB
Be nice. It's his first time at school. MARLIN
He was born with it, kids. We call it his lucky fin. NEMO
See this tentacle? It's actually shorter than all my other tentacles but you can't really tell.Especially when I twirl them like this. SHELDON
I'm H2O-intolerant. [sneezes] TAD
I guess we all have something, eh? What's your "lucky fin"?