When you're looking forward to leaving work early or on time, but are kept late either by a new assignment from your boss or a chatty coworker.

The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.

When you're having a sexual dream and it's interrupted by your alarm clock.

A clock block is a customer or co-worker that asks you a question or distracts you right as you are about to clock off for the day.

Some schools have a time policy for professors which allows students to leave if the instructor does not arrive after a given amount of time. Clock Blocking is when a professor arrives just before this time expires.

when you had the opportunity to get lucky, but are not permitted to due to time constraints

to tell the time before anyone else gets the chance to; similar to the cockblock, but for the current time, not penetration