Plankton has a new invention that allows him to switch lives with Mr. Krabs. He is so excited because once he has Mr. Krabs life, he will also have the Krabby Patty secret formula. / When Larry the Lobster is short one man for lifeguard duty, SpongeBob volunteers. Larry describes all the perks of the jobs: tanning, the chair, the whistle, the attention. What SpongeBob doesn't get is that you have to be able to swim.