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Old Reliable Geyser is located close to an observation point in Mount Rushmore.

Agent P crashed Dr. Doofenshmirtz's drilling machine (Drill-inator) into the Geyser and then Doofenshmirtz's machine explodes with Doofenshmirtz in it while Perry escapes ("Candace Loses Her Head").

It is an allusion to the Old Faithful Geyser located nearly 300 miles to the west in Yellowstone Park. This is also the name of SpongeBob SquarePants's lucky jellyfishing net.


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