The Slivki Show, a hit in Kiev and all points YouTube east of Berlin, had so much fun with past sparkler experiments that they set of 10k of them all at once.
With some supervision from his loyal calico cat (we are guessing Slivki is all about the ladies), he picked up a few cases of low-pyro grade holiday sparklers from Poland (Zimne ognie!), buried them in a bucket of sand, and rigged a fuze from (wait for it) spare sparklers.
What could go wrong?
Anyway, to see the furious meltdown that probably made Vladimir Putin put on his Ray Bands all the way in Moscow, check it out.