I'm aware of the lime slice. A beer was once served to me that way and the slice blocked getting the beer out. A guy next to me reached in to the get slice for his rum drink and got his fingers stuck in my beer bottle. Eventually an ambulance had to be called for him as others in the bar pitched in to help get his fingers out, but he did get the lime slice. Unfortunately, I never got to drink my beer and I never went back to that place. Citrus in beer! Humph!