The most annoying things when watching TV is loud commercials. It’s an effective way of brainwashing and there is nothing you can do about it. You can always turn volume down or hit another channel. Techbitar suggests using simple electronics to adjust TV sound on loud commercials.
His solution uses an Arduino, sound sensor and IR LED to get things in control. Arduino simply monitors sound level and when it reaches some threshold, it sends IR command to lower TV volume. Device has an IR receiver which allows to record commands from remote, so it can be used for many types of TV’s. Probably you wont be able to watch TV any louder than hard-coded threshold. So this may be a problem in some cases, but a little tweak could solve this problem too.