I've been playing Minecraft on a server and I was using snowballs for fun. I'm not sure what happened, if it's a plugin, command or something else. The snowballs are exploding like TNT after they're shot! They also have the animation and effects of being lit on fire like a thrown Ender Charge. Why is this happening? 
The server could be doing this in a number of ways. It could be using a custom Bukkit plugin, or it could be using a command block sequence.
If you want to do this in your world, you can with command blocks. Put the command execute @e[type=Snowball] ~ ~ ~ summon Fireball ~ ~ ~ on a clock, preferably a fill or setblock clock. Any snowballs in the world, wether thrown or dispensed, will be turned into fireballs. However, this won't apply to dropped items snowballs.
