Zombie head
Skilling speech bubbles was removed from RuneScape after an update, but still exists in-game for those who had obtained it.
Skilling speech bubble

Skilling speech bubbles is an animation that can be obtained from the 15 Year Anniversary Celebrations, by adding 8 statues to the party garden. The animation is based on RuneScape Classic's skilling thought bubble animation.

This animation can be toggled in the Game settings menu of the Settings menu in the Miscellaneous settings tab. It applies to 20 skills, excluding Attack, Strength, Defence, Ranged, Magic, Constitution, and Dungeoneering. The animation is shown alongside normal skilling animations rather than overriding them.

Skilling speech bubbles also feature in the emote of the classic cape.