I just remembered that Aggie promised Mater to find his hood when she was stiil a child, and I like to reuse that scene from Cars credits for future chapter, like this.
Aggie was in her new shop, baking delicious cakes. It's not easy nor hard for her to bake cakes. It's only usual ingredients, and usual procedure, just with some tricks she made all by herself.
When she saw Mater, accidentally lead the tractors to the town again, she chuckled as she missed that. Then, she suddenly remembered that she made a promise to Mater that she will find his hood one day. Since she already had wings and has powers and magic, Aggie put her rolling aside, and left her shop.
"Mater, what did you do this time?!" Sheriff shouted while trying to catch one of the tractors.
"I wasn't tractor tippin'!" Mater replied.
"Then where did all these gol-durn tractors come from?" He yelled.
Suddenly, much to the whole town's surprise, all tractors became immobilized and levitated in the air. It was actually Aggie, who fired magical white beam from her wandstaff to the tractors, and sent them back to the field.
"I hope they didn't make any mess for me to clean up." She snickered.
"Ooh, Aggie, I wish I have a-magic like you." Luigi squealed.
"Just go to my I team HQ anytime, and I'll teach you how to use magic properly." Aggie said, then turned to Mater as she rolled pass the town hall, "Mater, can you come along with me for a minute?"
"Sure do, girl buddy!" Mater followed her, "Uh, where are we goin'?"
"Do you remember the promise that I'll find your missing hood for you?"
"Yeah, I remember. Why do you ask?"
"Well, today is the day. I'll find your hood today without an attempt rest."
"Uh, I already tried findin' it within the town, but I couldn't found it."
"Then, let's find it outside of town."
Mater and Aggie were trying to look for Mater's hood, but it wasn't there in any places, like the Rolling Hills, Cool Pool of Tranquility, Tail Light Caverns, and through Enchanted Forest. There is one place that they haven't checked yet.
Mater was at the edge of a low cliff, waiting for Aggie to find his hood.
"Hey, Mater!" Aggie called as she flew up back to her friend, "Look what I found." She showed him his old hood.
"Hey, it's my hood! It's my hood! I ain't seen this thing in 36 years." Mater exclaimed happily as Aggie threw the hood on Mater's open engine. "Well, it fits perfectly. How do I look? ACHOO!"
Unfortunately, he sneezed, removing his hood in the process. The hood hit Aggie, making her yelp, and her interdimensional remote control was accidentally activated, causing it to open a portal to another world. The hood fell into the portal, and the portal automatically closed.
Mater and Aggie helplessly watched the hood fell into the portal, and went silent. Aggie felt guilty for losing her friend's hood.
"S-sorry, Mater." Aggie shrugged.
"Oh, dang." Mater sighed.