Trivial things that make you annoyed beyond expectations?

[Ming the Merciless]

AI Overview
In 12-hour format, you should not use a leading zero for single-digit PM numbers. A leading zero (e.g., 07:00 PM) is associated with the 24-hour clock (e.g., 07:00 or 19:00), and its use with "PM" can cause confusion.
Correct formatting in the 12-hour clock
Use single digits for hours 1 through 9: The standard and most common practice is to write hours from 1 through 9 as a single digit.
Correct: 7:00 PM
Incorrect: 07:00 PM
Do not use leading zeros for PM numbers: Including a leading zero can be confusing because it is standard for the 24-hour clock and can be mistaken for the wrong time of day.
Correct: 1:30 PM, 9:15 PM
Incorrect: 01:30 PM, 09:15 PM
Consistent formatting is key
Across different formats, consistency is the most important rule.
For 12-hour times: Stick to single digits for hours 1–9.
For 24-hour times: Use leading zeros for hours 00 through 09 to maintain a consistent two-digit hour format. For example, 9:45 AM becomes 09:45, and 7:00 PM becomes 19:00.

AI overviews annoy everyone beyond expectation

 

[Andy in Germany]

Whenever is see someone/software/car clock display/etc show a hybrid 12-hour/24-hour time display.

For example, the clock will show 08:00pm where it really should be 8:00pm or 20:00. 08:00 is correct, but 08:00am is not (there should be no leading 0).

D*mn you sirrah: now I can see it I won't be able to unsee it.

Fortunately, we use the 24h clock as standard here so it's less of an issue...