"Going postal" is an American English slang phrase referring to becoming extremely and uncontrollably angry, often to the point of violence, and usually in a workplace environment. The expression derives from a series of incidents from 1986 onward in which United States Postal Service (USPS) workers shot and killed managers, fellow workers, and members of the police or general public. (Wikipedia)
Example: Jane went postal when her colleagues changed her screensaver image.
A list of things you'd like to do before dying (kicking the bucket).
Example: Now I can cross "seeing the Taj Mahal" off my bucket list!
The same day over and over. Doing the same things repetitively. The expression was popularised through a movie of the same name.
Example: Life goes on. Every day is groundhog day. Eat, work, sleep.
Murdered (and thrown into the sea)
Origin: "It's an old Sicilian message. It means Luca Brasi sleeps with the fishes." Sal Tessio in "The Godfather".
Example: Where is he? He's sleeping with the fishes. What did you think?
Commit an act of sabotage.
Example: One teacher said, "It would be better to ask for more examples but we can't move the goalposts now."
A no-win dilemma or paradox, similar to "damned if I do, damned if I don't".
Example: What would happen if you went back in time and killed your grandfather? (from The Urban Dictionary)
Creating a deliberate distraction.
There is a story attributed to the Australian political strategist Lynton Crosby, in which a CEO is confronted with poor statistics at a board meeting, and to divert attention from this unpleasant news, he pulls out a dead cat and throws it onto the middle of the table.
Example: "Trump apparently has an endless supply of dead cats, seemingly able to conjure them from insignificant news stories and throw them on the boardroom table by way of an angry tweetstorm." (Jesse Jackman, Huffington Post, 2016)
Waiting for an event that is expected to happen, because it usually follows on from what has already been observed.
The expression is thought to derive from the following anecdote. A guest checks into an inn one night and is warned to be quiet because the guest in the next room is a light sleeper. As he undresses for bed, he drops a shoe, which, sure enough, wakes up the other guest. He manages to get the other shoe off in silence, and gets into bed. An hour later, he hears a pounding on the wall and a shout: "When are you going to drop the other shoe?"