Inspired by Sonar.
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Tobi was just finishing cramming Deidara's primed clay in Sasori's puppets.
Tobi had it all planned out. He was going to wait until Sasori discovered the clay, and Tobi had a recording of Deidara yelling 'KATSU!'.
All Tobi wanted to do was to see some expression on Sasori's face. It was so bland all the time.
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Sasori went to polish his puppets. He polished them off once a week, to keep them battle ready, and Deidara proof. Deidara would love to prove that art was only an instantaneous thing, and turning Sasori's art into his own would be the icing on the cake.
Sasori pulled out his first puppet, and discovered the clay all through the puppet. Sasori glanced around, bored. As he began to remove it, Tobi played the recording.
"KATSU!" Deidara's voice seemed louder because of his anticipation.
Sasori's face filled with shock, and if anyone could see Tobi's, they would have seen the same.
You see, all the clay blew up, in both of their faces.
Both got through alright, only minor burns, and nothing Sasori couldn't buff out of himself. It was when Tobi landed in front of him that Sasori was confused.
"Tobi didn't know Deidara-sempai's clay was voice activated!" Tobi exclaimed with disturbing mirth, considering he was still on fire.
"Tobi...you're on fire." Sasori returned to his emotionless state.
"YAY! ! ! Tobi wears more orange now!" Tobi ran off.
Sasori blinked. It was too troublesome to figure out.
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The real reason Deidara's clay blew up, was because Deidara came home early. The first thing he noticed, was his armed clay was missing.
So he walked to Sasori's room, and yelled. "KATSU!"
It coincided with the recording's voice, and blew almost all of Sasori's puppets to pieces.
"Kami-sama's got a good sense of humour..." Deidara smirked.
"THERE IS NO KAMI-SAMA! ! ! THERE IS ONLY JASHIN! ! !" Hidan yelled.
Deidara didn't care. Blowing Tobi and Sasori up already marked one of the best days of his life.