Noodle Incident/Advertising

Somewhat cleverly used in GEICO's "Biscuit" commercial. Note that the boy's mother looks like she's about to say something, then just sighs and walks away. Apparently, this isn't the first time he's done something like that.
The commercials for Bing & Decide play with this. While some don't qualify, others certainly do.
A serious of Above The Influence Public Service Announcements show a much darker variation of this trope. They take the form of teenagers talking on their cell phones the morning after a party where they got so drunk and/or high they can't remember anything. One features a girl receiving a photo of herself doing something (presumably) embarrassing and raunchy, and then finding out the photo's been sent to the entire school. Another features a boy talking to a friend, and finding out that something bad has happened to a female friend (possibly the sister of the person he's talking to?) that he abandoned at the party. The viewer is never told or shown details; it's left to the imagination just what happened the night before.
The new State Farm commercials where a guy crashed his car in pretty much impossible ways, such as backing up into a pole or through the side of a concrete building. We are never told how he did it, but according to the Agent he does this quite often.
New Taco Bell commercial features a guy coming home after a night out, unloading a bunch of random stuff from his pockets (concert ticket stub, broken sunglasses, dice with Chinese characters on it, etc.), leaving one to speculate just where's been all night, and how it all got started with a packet of Taco Bell hot sauce...