RULES

There are rules that you should follow during the London trip. 

 1. Do not crumble your underground ticket like shown on the picture

 2. Check the money people give you as an exchange, it might be old to pay for it later

 3. Don't fool around during crossing the street with expensive equipment in the open bag. This is what can happen if you will do that.  After that the lens broke and made sound that can be scribed as a musical instrument inside

4 Check the cup or trap-pot when you try to revenge on someone, because you might do that on someone's else cup or tea-pot. Be careful.