The improper usage of the phrase "by accident". Started in the United States, but it has started to spread to other countries like a plague. A terrible, terrible, grammar plague.
Cleetus: "Hey Maude, this 'ere critter dang near made me spill mah beer on accident."
By Aurore
ACCIDENT
An event; when one urinates or fecalizes prematurely to reaching an established restroom facility, typically staining one's clothes and causing much embarassment.
Billy: "Teacher! Clyde shit himself on the swing!"
Teacher: "No, no, Billy! Clyde had an 'accident'..."
Billy: "Nawp. He shat himself and flew right off that sumbitch!"
'accident' Person 1: "I saw your hand down there and heard some noise, I call bullshit!"
Person 666: "It was merely an accident."
Person 1: "Oh, spare me your rhetoric, you know that your hand and arm didn't just magically spasm near my girlfriend's ass."
a social outing between two acquaintances or friends that, unbeknownst to one or both parties, is actually a date.
"I thought that we were just going to talk business when I agreed to meet Paul for coffee, but then he put his hand on my arm and told me I was beautiful and I realised that I was on an accidate.'