This forum will consist of me putting a list of episodes down, and you have to guess what they've all got in common, they will never be in any particular order. If it takes a bit long, I'll give you a clue.
OK then, let's start with this list:
Barnacle Face
Neptune's Spatula
Plankton's Good Eye
Suds
Life of Crime
Snail Mail
Squid Wood
Krusty Krushers
Squirrel Jokes
The Fry Cook Games
Burst Your Bubble
Jailbreak!
Overbooked
Shell Shocked
The Krusty Plate
Plankton Gets the Boot
Nasty Patty
Hooky
Driven to Tears
A Pal for Gary
One Coarse Meal
The Cent of Money
Pink Pourliner
Gary Takes a Bath
Jellyfish Hunter
Plankton's Regular