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When I first started riding in the 90's I made the mistake of sourcing a lot of kit from Halfords. I bought a cheap pair of 700c tyres and went home to fit them. Sure enough, gave myself quite a surprise when the first one blew off the rim.
Took them back and complained and the head of the cycle department said something along the lines of me being an idiot so I asked him to fit them. He put the tube and tyre on and got it to about 30PSI and said 'there you go'.
I suggested that it was too low to ride at that pressure and so he kept pumping. When the tyre eventually let go it went with an almighty bang that sounded like a gunshot and echoed around and about the large, aluminium warehouse unit that was (and still is) Halfords Epsom branch with the whole shop diving for cover.
He refunded me.
Blowing a non tubeless tyre off a tubeless rim makes QUITE THE BANG.