Why would a pilot ask the tower to turn the VASI off? This past Saturday I was taking off from runway 22 at Catalina Airport (IATA: AVX) when I heard on radio a GA pilot requesting the tower to turn off VASI after requesting weather advisory.  I did not know if that airplane was on ground or in air.

As the clouds were gathering over and I am not an IFR pilot, I was concentrating on the fast moving clouds. After a while he asked for VASI to be turned back on.

I wonder why did that GA pilot ask to turn off VASI and get them turned on shortly afterwards?

On a side note, I got lucky and saw the giant Shuttle fuel tank being towed down below near LA Forum to LA Science museum; took some pictures!
It could have been a flight instructor with a student that was becoming too reliant on the VASI's slope information for visual approaches to landing, and he wanted to force the student to do without.