How do I create a halftone pattern inside a comic bubble in Photoshop?

First, create your bubble and add your text. Then, create a new layer above the text layer. Go to Filter > Pixelate > Color Halftone. Adjust the settings (Max Radius and Levels) to achieve the desired halftone effect. Set the blend mode of the halftone layer to 'Multiply' or 'Overlay' to blend it with the text.