The launch went up safely, got into an orbit, and a cosmonaut, Alexei Leonov, became the first human to perform a spacewalk. Super. But that was about when things took a turn for the cataclysmic.
On his way back in, Leonov's spacesuit inflated due to the vacuum of space, which, apparently, the guys who designed the suit had never heard of. His suit was so laughably ballooney, in fact, that he could barely move and most definitely couldn't fit back in the spaceship door. Leonov was forced to let some air out, all the while suffering from heatstroke and the bends. By the time his little 12 minute walk turned into a 20 minute walk, he was up to his knees in sweat. But he made it back in to the ship, safe and sound.
However, things got worse for Voskhod 2 after that. Read all about it at Cracked. NSFW text. Link -via reddit