Important Thing!

Important Thing! is the twenty-first Trouble Center mission in Paper Mario: The Thousand-Year Door, initiated by Frankie.

Mission
Mario and co. must head to the west side of Rogueport near the vent entrance, where Frankie will state that he dropped his Wedding Ring in Rogueport. Mario must then cross the stream near Garf's house with Yoshi and obtain the Wedding Ring to take it back to Frankie. He will reward Mario with the Gold Card, ending the mission.

In-game description

 * "I'm lookin' for somethin'. I can't say exactly what here, but I can tell you in person. I'm waitin' on da west side of Rogueport."