The Indestructible Shield
Bruce Banner wanted to do an experiment, ached to do an experiment. He knew that Captain America's shield was indestructible, but he wanted to test it, and its owner, under all conditions. "Hey, Rogers…you're not busy, are you?"
"No, why?"
"I have a test I want to do, but I need you and your shield."
"Okay."
Steve Rogers stood in the center of a large room underground. His shield reflected what light was in the room, and the white star on his chest gleamed. The room started to grow warm. Sweat dripped off his chin. Banner walked into the room. "I'll be testing you and your shield in different conditions."
"Okay…"
Banner transformed into the Hulk. "RAAAH!"
He crashed his fists down on the shield, and did no damage. Rogers jumped back. "Nice hit you've got there, son…" He pulled the mask off his face, and sweat dripped off his nose. "Man, it's hot!"
The Hulk appeared behind him. "RAAH!"
"Whoa!" He dodged the fists. "Watch where you put those things, son…"
He threw the shield and it hit the Hulk dead on, but bounced back, doing no damage to the beast. The temperature in the room switched dramatically. "Getting cold now…"
"RAAH!"
A very bitter wind blew through the room, and Rogers pulled his mask back on.
Steve Rogers sat shivering with a blanket on his shoulders and a cup of hot chocolate, staring down Banner and Stark as they looked over the degeneration of the Vibranium shield. "Sorry about that."