Bill Clinton visited both the Grand Canyon (in 2000) and Yellowstone (in 1995). President Clinton stayed in the Mary Colter Suite of the Grand Canyon's El Tovar and had lunch at Yellowstone's Old Faithful Inn. President Clinton and the First Lady also took a stroll around Old Faithful Geyser.
Exploding Water in the Microwave. It's practically an urban legend: a man heats water in the microwave for a cup of instant coffee. While taking the cup out of the microwave, he notices the water doesn't have any bubbles...at which point, the water boils up and explodes, giving him burns on his face and hands.
A spaceship with liquid hydrogen and liquid oxygen will blow up quite well in the vacuum of space. Chemical explosives will also explode in space since they function by breaking weakly bonded chemical components; no oxygen is necessary. Nuclear explosions can of course occur in space, too.