Almost every episode of Mythbusters has something that goes "boom". That's because they have an "in" with local and federal cops, and access to stuff that would put the average American or Californian in jail.
Some of their stuff is amazingly good, like their Civil War hybrid/solid fuel rocket. The launch was jaw-dropping, looking like a cruise missile launch.
Other things are dumb, or just obvious. Stuff involving firearms always gives me a chance to yell at the TV.
Still, it's an entertaining exercise in testing-to-excess on a big budget. Of course, for entertainment purposes they often trip themselves up with scaling factors. A few 15-minute segments were on things so simple, I could write out the math on the back of an envelope in five minutes. But that wouldn't be nearly as entertaining for most folks, although I appreciated the mathematical exercise.
And yes, they made a lead balloon, and it (sort of) flew.