The words within, that a person doesnt really say, but is thinking.
Jim the department manager is great at comming up with lofty new idea's yet little details on how to get it done. Sure wish I could read his thought bubble and connect the dots.
The way a superhero's thought can be heard by a comic's readers. Similar to the Shakespearean 'aside' or 'soliloquy'.
Diggity Monkeez: ...just like the Shakespearean soliloquy.
Diggity Monkeez (in thought bubble): I hope I spelled/pronounced 'soliloquy' correctly.