Whenever I think of carbide I think of carbide cannons. Probably something which could get you in trouble these days. Here's a video of one being fired and the 2nd explosing is a whole lot louder than the 1st. Don't know about the guy putting his lips/mouth on this cannnon and bet the dog loves the noise. Maybe that's why he's barking ahead of time since he know what's coming?

Speaking about obnoxious noises; here's another story about putting a "whistle tip" in the end of a tailpipe on a car. Don't know where some of these people come up with these things and hope they never become popular around here. "Just for decoration", yeah right!