An Known Product, A New interaction

I am a product design student in Scotland and in year 3 beginning research for an individual project.

My main inerest is within interaction design and a fascination of how users will interact with products. Is there a specific product you use on a daily basis without thinking about it? Or a service?

Could you name a product/service inwhich you have become emotionally attached to?

Is there one product or service that makes/made you feel uncertain/scared/shocked or any other than at ease with it?

replies would be most helpful