xkcd.WTF!?

Explanation ➲

Shining a laser at a plane is a federal crime in the United States, and similarly proscribed in many other locations. A sufficiently powerful laser can disorient, distract and/or blind the pilot operating the aircraft. This can prove particularly dangerous to the safety of the aircraft and its occupants during takeoff and landing, when planes are likely to have altitudes and orientations particularly susceptible to laser interference, and are phases that are already hazardous periods of flight. This 'use' of lasers was previously discussed in 3030: Lasering Incidents.

Megan humorously claims that there's another reason why lasering a plane is illegal: to avoid provoking cats into leaping at them. Cats are known to chase and jump onto the dots created by laser pointers. Cats also prey on birds, with estimates of 1.3 to 3.7 billion birds killed each year. Of course, a cat would be unable to jump to the height of a flying plane^{[citation needed]}. If the cat were able to reach the plane, it would find itself hilariously outsized, though colliding with the plane midair could cause damage akin to a bird strike (e.g. shattered windshield or engine failure).

The title text alludes to the fact that cats do not like getting wet, and one of the methods people use to discourage cats from a place (or activity) that is unwanted is to use spray bottles to wet their fur. The spray bottle might also emit a hissing sound, which cats associate with other cats threatening them. The "wing mounted spray bottles" on aircraft could be a reference to fuel dump tubes, which spray out fuel to lighten the aircraft, commonly used before emergency landings (especially soon after take-off, when a nearly full load of fuel is now more trouble than it should have been). To combat against actual physical threats to aircraft in real life, El Al (The Israeli national airline) and government aircraft used by heads of state often have various countermeasures installed.