Taking a punt here but that joke is likely to be a punishable offence
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You’re really pushing people’s buttons with that one…
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No 'shroom at the bar? 
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It’s a piss take, or should that be a shitake.
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Reported.
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I doff my cap to you… 'spore effort, but I keep stalking these threads in the hope of something better…
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On the way out he caught her eye - they walked back into the bar,
Fung-us - the bartender couldn’t resist.
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Mushrooms?
Breakfast of champignons.
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Suspect @Jim has done better many times without claiming any pretentious arty-farty nonsense.
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Well, arty anyway
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Not so visible though, except maybe where it causes the paint to start flaking off the furniture 
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In the early days physicists made small clouds in cloud chambers to visualise the tracks of sub-atomic particles. A variant was the bubble chamber where the particle passed through a superheated liquid and caused a trail of tiny bubbles to form along its track.
The window of my first office at work looked out towards a particle accelerator and there was a very thick (3-4ft ?) concrete wall between me and the business end of the machine. I assumed it was radiation shielding until one day one of the accelerator people said that it was actually built for blast protection against ‘little accidents’ with their bubble chamber. The chosen medium was liquid hydrogen and the chamber contained about 25kg of it - enough to make a very impressive bang if it should happen to ignite in the presence of enough oxygen and something to contain it.
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More of a sad pun instead of politics:
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