This one is a bother to everyone within a 5-foot radius:
When you go shopping, whether it's at the grocery store, Target, Kmart, Macy's, the local general store, please look around and note that you are in a store and not a f***king phone booth.
Every time I run errands, there's some dunce either wandering aimlessly among the aisles, blathering away, usually about some interesting-only-to-them personal problem; or some other dunce who walks in yapping on the phone, s/he grabs a cart, and then parks it right in front of the very item I need.
Both are irritating, especially when, as is usually the case, the yapper is loud, and doesn't really care if innocent bystanders have to hear about how her emotionally stunted boyfriend can't commit.
In a store? Here's a novel idea: stash the phone and shop.
* please note that there's nothing wrong with taking a quick call in the store -- sometimes you're needed. But a half-hour blather fest that really should be at home with a glass of wine? Not in the store.