Before I went shopping last night, I noted that I was low on bubble bath but decided I still had enough for another few baths and would just put it on next week's list.
When I'd paid for my shopping and swiped my Nectar card, the till spat out some personalised coupons for me...one of which was for bubble bath.
They not only know I use it, they know exactly how long it takes me to get through a bottle! Damn them! Damn them and their snooping and their spying and their 20p off!