We won the damn Carnival fish in that ping pong ball game 4 or 5 years ago.
They are in a 30 gallon tank now and are huge - like 8 inches.
One does swim upside down frequently, but I think it is because it is a voracious eater and ends up overinflating its swim bladder. and goes off balance.
Goldfish bowls are not appropriate for goldfish unless you want them to be ex goldfish.
By the way, goldfish are very dirty fish, if you plan on keeping fish, they are not the easiest.