No, it will summons 2 "minions", Sans and Papyrus. Sans won't do anything, but Papyrus has a health bar, and NPC attacks are mostly focused to him. He will throw bones and occasionally do a "Blue" attack (which nobody can dodge cause everything in Terraria moves). The background will also play Bonetrousle. If Papyrus was killed though, well...
*YOU'RE GONNA HAVE A BAD TIME*
Sans go Megalovania mode, and use his deep blue attack to throw every normal monster up to space, and anything that DIDN'T die from the attack will be surrounded by Gaster Blasters that fires lazers RAPIDLY, each will do ONLY 7 DAMAGE, but it will stay there until it's dead (yes, this applies to worms, rip Destroyer) and will ignore Defence. This item can only be used once each time you "LOAD" the game (so you just quit the game then come back) and it is also a consumable. It can only be get through the Dungeon Guardian.