I famously (among my friends) once received a phone call from my bank wishing me a happy birthday. At the time, getting a call from the bank, period, was very stressful for me (hasn't changed all that much), and as I thanked the caller and (politely, as I saw it) asked that they not call to wish me a happy birthday again.

I have been told that I am the asshole for this exchange, but I stand by this statement: it's not a personal touch if you do it for/to every customer; it's just a waste of time for all involved. And I would still say that I don't want my lawnmower singing happy birthday to me, and that I would rather just pay less for a lawnmower that can't do this.