Right-clicking a Mob Spawner with a Mob Egg will crash your game.

If you get a Mob Egg that you get from the command, "/give @p Minecraft:Mob_Egg" you will get a empty egg. The egg is useless but when you right-click it on a Mob Spawner your game will crash and you will have to restart your game.

Thank You,
Nathaniel Van Velzer