Do you want to be in a good mood ?

Thync, a Los Gatos startup, is launching publicly Tuesday with a device that sends electricity to the user’s nerves to alter their mood and mental state. The user has two options: become calmer or more energized

https://www.mercurynews.com/2015/06/01/wearable-tech-2-0-aims-to-alter-mind-body/
Hi everyone ! 
Changing people's mood is at the same time amazing and scary. I would personnally prefer doing meditation if I want to be calmer or practicing sport when I want to be more energized. What about you ?

Indeed.
I say, there is another method : tell somebody he's running a very serious illness. A moment later, tell him (or her) that it was just a joke

of course we can easily change people ‘s mood without any sophisticated devices