What is the origin of the idiom "pleased as punch" and when to use it?

The origin of the phrase "pleased as punch" can be traced back to the character Mr. Punch from the traditional Punch and Judy puppet shows. Punch is a mischievous and often violent character who is known for his exuberant and self-satisfied behavior. It can also be used to express satisfaction with a particular event, such as a successful party or a well-executed performance. Additionally, the phrase can be utilized to indicate overall happiness and contentment with life in general.