This is located in the mission Welcome To Planktopolis. Minions during the Monument-Al Destruction tasking. When you get to the high ledge overlooking the lava pit (across from the twin Plankton statues) go right and fall onto the ledge next to the castle wall. Follow the ledge around until you get to an alcove. You will then see a series of messages being displayed with the following information in individual boxes:

Heavy Iron's Best Times

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No Weenie Parking Anytime: 2:54
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Rub a Dub Dub, Slip Slide in the Tub: 2:43
Sandwich Driving 101: 2:37
Sundae Driving: 3:55