f.ex. the timing is a bit easier because that's the only thing happening on the floor, and there's a decent amount of time in the buildup of each shot. All they have to do is note whether it goes in or not, and if so, point and yell Whoosh Cecil, or whatever that's changed to in the last 20 years.
I'm betting after a OffReb, as it gets kicked out, there'll be a lot of buzz in the student section of the more well trained ones (relatively) quietly saying bingobingobingobingo to everyone around them, so everybody will be ready to yell it in unison once it splashes, just like they would a free throw.
It'll be fun to see if our kids can make it a solid thing. I do love a well informed fanbase.