The number four is extremely unlucky
The number four (‘shi’) is widely avoided in Japan since it sounds too similar to the Japanese word for death. Keep an eye out in Japan and you’ll notice buildings don’t have a fourth floor, items are sold in sets of three or five and special care is taken to avoid encountering the number in daily life.
There were five Japanese cities on the US’s initial atomic hit list and Nagasaki was not one of them
While filming Goku's Super Saiyan level 4 transformation for Dragon Ball GT, Sean Schemmel passed out.