— Patrick's underwear, "The Gift of Gum"
Patrick's underwear is an old pair of white and light blue briefs.
Role in series
SpongeBob and Patrick are both in a grapple, each straining to bring the other one down, until the strain finally proves too much for their pants to withstand. Both of their pants began to rip and fall down revealing their briefs. Patrick's underwear is yellow and SpongeBob's underwear is pink—the color of the other person—leading to them both crying and hugging each other. Moved to tears, the two friends reconcile and agree never to fight each other again, walking out of the arena. As SpongeBob and Patrick leave the Fast Food Coliseum in their underpants as best friends, Patrick notes that his underwear was originally white when he bought them.
When they realize that they will never get past the monster-infested trench, SpongeBob loses hope and cries to Patrick that the two of them are just kids because they eat ice cream, blow bubbles, and worship the Goofy Goober peanut. Patrick convinces him otherwise, stating that they do not worship Goofy Goober, only for SpongeBob to pull down down Patrick's pants and reveal his Goofy Goober underwear that he's been wearing for three years straight.
A little later in the film, during the song "Now That We're Men," Patrick sings that he has finally changed his underwear, resulting in an urchin tearing his pants off to reveal a normal plain pair of underpants instead of the Goofy Goober ones he was wearing earlier.
"The Gift of Gum"
Patrick's underwear is seen after it crawls out from Gummy. It crawls onto SpongeBob's face and tells him in a raspy voice, "You're not Patrick." SpongeBob screams in terror when he hears this and Patrick's underwear crawls away.