Lol omg, I had a similar experience!
A week or so ago, I was having a disorganised morning and i thought "oh, well i can probably grab a blueberry muffin from 7-Eleven (something i used to do frequently) and can just be very careful the rest of the day". So I went to 7-Eleven, picked up the muffin to check the calories... 600! In one muffin! If i ate that, I would be so hungry by the end of the day if I didn't go over my calorie goal. So that nasty muffin went back on the shelf, thank you!