I was playing singleplayer vanilla ans i saw a skeleton, then in a few more blocks i saw a enderman. By then it was about midnight (ON MINECRAFT) and i started to see there were blocks missing. So, by that i was freaked then i saw my game said you dont know what you just did. and the next minute i was dead. $20 that it was sister putting mods on. *Shes a programmer believe it or not*