As you may know, Mrs. Poppy Puff is a pufferfish and is Spongebob's boating teacher. Her husband was turned into a lamp.
BUT, what you may not have realized is that she is a BIG FRAUD!!
In "No Free Rides", Mrs. Puff gives Spongebob his lisence, but has second thoughts. She says:
Mrs. Puff: What have I done? Everyone will know I let him slide through school. I'll have to move to a new city, start a new
Boating School with a new name! No! Not again! I've got to end this thing before it begins!
The key thing here is "No! Not again!" This pretty much means Mrs. Puff is not her real name and she is not from Bikini Bottom.