Tool BUBBLE

From RealWorld Wiki

BUBBLE is a drawing tool capable of enclosing shape drawn by the internal tool in a comics-like bubble. Since BUBBLE is a meta-tool, it requires another tool to specify content of the bubble - usually the TEXT tool.

BUBBLE only has a single parameter, which defines the color (and transparency) of the bubble. The bubble has no outline, but the STYLIZE meta-tool can be used to add a black outline by using a small snadow with very high density.