We all know that sandy from sponge bob comes across as smart but in the episode where they first meet you would think that sandy would be smart enough to know that no sea creature can breathe air or live in a place with no water, amirite?

Remember? Spongebob was like "air? Oh I love air." in an attempt to impress her even though he didn't actually know what it was. So he lead her to believe that.

she may have also been smart enough to know that a sponge is not a sea creature and shouldn't breathe at all.

Obviously, she was smart enough to work around that problem.

I appreciate your avatar.

She WAS pretty new to the ocean world at that point... ?