I bought a little bunny/The Seven Substitute Shinobi

[drakensis]

The thought of Shikanenai being trained by Kakashi, Konohagakure's other most annoying jounin sparked off an explanation for why Kakashi tends to stand on the torii at the bridge he uses as a meeting spot for Team 7, rather than on the brodge itself.
"Ohayo!" Kakashi said, poofing into existence on the bridge.
"Hope we didn't rush you," said one of the two genin waiting for him.
Hmmm, something wrong there, Kakashi thought. One, two... Neshan, Katsu... "Ara... where's Shikanenai?"
At that point he felt a hand latch onto his ankles and with a crash was dragged through the wooden decking to land on the water underneath. And since the water wasn't all that far below the bridge, prompty cracked his head on one of the support beams.
"I don't think the Groundhog Technique Decaptitation is supposed to be used like that," he told boy who melted out of the shadows under the bridge.
Shikanenai grunted something about lazy assholes deserving a bath and swung himself up through the new hole in the decking two seconds before the explosive tags in the water disrupted the water tension that Kakashi's chakra was latching onto.
D for Drakensis

You're only young once, but immaturity is forever.