Patrick holds up Pete.

Pete is a pet rock seen only in Sentimental SpongePatrick gave it to Spongebob just prior to the events of the episode. Patrick was angered when he oversaw Spongebob throwing Pete away, which caused him to tell Spongebob to be more sentimental toward his memories. Spongebob then tried to keep everything and eventually became a hoarder. Spongebob and Squidward's houses were then condemned by the Police for safety reasons, so he took pictures of all his "friends" and threw everything away. It is assumed that Spongebob took a photo of Pete prior to throwing him away, but what happened to Pete afterwards is unknown.