Pop the bubbles or just watch them float up the screen. (This requires a webcam. ) Pop the bubbles with your face or hand etc.
Thankyou Scratchteam for idea and main code! - Added music. It's a bit annoying if you listen to it for half an hour, like I did but otherwise it's fine. -Now bubbles change to 'Pop' costume so it looks more realistic. -Added underwater background which looks cool in a bedroom because it looks like you're underwater. -Got any ideas? I'll have a go if you post them.