When humans pee standing up there's a greater distance to cover so the urine breaks up, preventing the electricity from properly channeling to the origin. Here, you can see the stream is continuous.
Really though, cell phones aren't as dangerous as, say, hair dryers. But as we all know, the physics in yukkuriworld change accordingly, allowing laws to be broken at will to maximize yukkuri suffering.
Actually, sugar water is not conductive at all. The charge would have a very hard time traveling up a stream of yukkuri piss like that. Even if yukkuris pissed actual electrolyte-rich urine, they probably wouldn't couldn't do it because the stream probably isn't a contiguous stream. Haven't you seen Mythbusters?
The only thing I see happening is that the old man is going to give the super-easy Marisa some sweet sweets for destroying his useless, fake "cellphone."
It was probably one of the cell phones from Steven King's "Cell".
>>the physics in yukkuriworld change accordingly, allowing laws to be broken at will to maximize yukkuri suffering.
Regardless of however sad you might find it, that's actually pretty spot-on. A lot of things happen that you're better off trying not to logically think about...