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When Senju Tobirama rushed into the Hokage office, Madara felt a shiver of dread tickle down his back. This usually meant either someone - usually Hashirama - was about to get the scolding of a lifetime, or that there was something about to blow in the village.
When he noticed the young man seemed to have forgone sleep for the past week - as demonstrated by his huge purple eyebags that made his look like a particularly maniac racoon, as well as the fact he was reeking of caffeine - Madara understood Konoha was about to fall.
When the albino produced a scroll while telling he had had a very productive night, Madara knew a world war was about to blow at any given moment now.
When he mentionned it would revolution the world, Madara thought about aliens about to invade the planet. Either that or the Shinigami.
As he was about to jump on the young Senju to knock him out, he saw Hashirama had this particularly regretful expression on his face, the one he bore each time he had to tell his brother his "revolutionnary invention" would end up on the kinjutsu scroll.
Before Madara could stop him, Tobirama unsealed something from his scroll and proudly showed it to them. It was... not a world ending jutsu, a zombie or anything that could trigger an apocalypse, at least as far as Madara could tell.
It was two simple pieces of fabric, held together by something... that Madara was unable to define. It looked like a thin metallic mouth with tiny teeth held together.
"What is that ?" Hashirama asked, voice torn beween interest and dread.
"I call it the zipper !" Tobirama said excitedly, bouncing on his heels like a child, "you can use it to close you clothes, your pants or your coats ! It's faster than all our belts and sash and other things ! It will make us gain a lot of time !"
This indeed sounded harmless and useful, and Madara felt almost bad to have doubted Tobirama.
"Cool," Hashirama said with a smile, "go to sleep now, Tobi."
************
A few weeks later, after Hashirama had more or less tied his brother to his own bed to force him to get some goddamn sleep, and after the zippers had been implemented and had meet a huge success, Madara had to admit he had been scared for nothing.
These zippers were indeed extremely useful and had allowed everybody to gain an awesome lot of time. However, for a reason he couldn't explain, Madara still had a lingering feeling of dread about these.
Sighing, thinking it was probably his healthy shinobi paranoia speaking, he finished emptying his bladder and zipped his pants up. An horrible pain suddenly closed on his dick and when he looked down, mouth opened on a wordless scream or agony, it was to see his poor dick stuck between the unforgiving metal teeth of Tobirama's damn invention.
"SENJU !!!!"