If you see money one thousand in front of you to do?

If I see one thousand in front of me ,I will suddenly pick it up and keep it in my wallet.haha And then I will go shopping and save some of its. In the past, I used to see a lost wallet. There is 800 bath in that wallet. I don't know who is the owner so I use that money for hanging out with friends and buy some new clothes. I used to see a lost wallet for one time in my life and I never wanted to see it again because if I see it I can't sent it back to the owner and I will spend all of money in finally.I think it's not good for me to do that.