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Вешать с чего-л. sounds wrong.
«Подве́шивать цвето́чный горшо́к к потолку́»

There’s an episode in the movie Nothing to Lose when one of the protagonists has got a spider on his head. “Get it off!,” he screams, and the other guy starts recording it with a camera....

There’s nothing to do with snipers in the joke.
The boy had in mind the meaning ‘to take a picture’ of course. His parents could understand that as ‘to take hanged men out from the gallows’.

ве́шает… пове́сили… ве́шайте


Sounds unnaturally.
I’d say:
Тут дежу́рный не про́сто ве́шает, а броса́ет тру́бку.

Я тебя позвал… (accusative).

Заяц.

It’s a rare word where я is беглая (how to say it in English? disappearing?). Historically, it used to be a normal я in all the cases, but due to an analogy with words ending with -ец, it...