Thanks for all the replies, some made me laugh, some made me cringe !
I know it's the forfeit for not picking your own stuff instore, but sometimes it's just too bizarre and surely a computerised system can tell that disinfectant isn't chocolate !!!
I'm vegetarian and I can remember being really annoyed a few years ago when they kept sending real meat instead of veggie burgers !
The worst thing ever in online shopping was a New Year's eve, Tesco were booked to deliver to me with all the tasty bits we needed for a family party night. The driver never came and when I phoned them, they said he had rung the bell and no one had answered, which was a complete lie because we had a door camera. I was fuming, luckily there was still time to grab what I could from local shops but there ended my relationship with Tesco !!