McDonalds

Ronald McDonalds at Metrotown not only has a new look, it also got very enhanced technology. Yesterday I had my annual visit to the restaurant before heading to Superstore to get some grocery. When I looked at the menu, I noticed they have Angus beef burger, I guess it's worth to give it a try. So I got the AAA class Angus burger, and an ice coffee! Yes, not Sprite this time, it's ice coffee! One stop shop for Vera's Burger and Starbucks! yay...
After I finished my meal, I chucked the trash as usual. Guess what! there's a red light on the trash bin. It went "bzzzzz" for like a minute, then went off and the door started to close. I wonder what it does. Did it eat up my junk?