Minecraft is easily one of the most successful video games of all time, but it was actually inspired by an earlier, open-source game called 'Infiniminer'.

The fact that 'Infiniminer' was so completely overshadowed by 'Minecraft' is awkward, but not nearly as bad as this Minecraft-mishap where a boy's grandpa accidentally thought he was asking for 'Mein Kampf' as a Christmas gift.