This item is found only in the mobile version(s) of Terraria.
Pet Worm is a pet summoned by using the Suspicious Looking Apple item. If the player has reached a certain distance from it, it will fly towards the player while wearing a red headband, leaving a trail of clouds behind it.
If the player dies while having this pet equipped, their grave will instead be a Strange Looking Tombstone.
The Worm Pet appears to be able to speak, its quotes being:
"Boring..." (Spoken when the player has stood still for a certain period of time.)
"Bye bye" (Spoken when the player dies)
"Grenade!"( throwing an explosive such as a Grenade)
"Incoming!" (Spoken when a Blood Moon begins, or a boss comes.)
"Victory!" (Occasionally spoken on defeating an enemy.)
This pet is a reference to the game series "Worms".
if you die with a pet worm, you will leave a grave that looks like a worm