cats behavior

Does anyone have any ideas why my cat would come into my room and look at the celling and one certain spot and keep meowing?

Ghosts maybe?

I really have no idea. Cats are weird.

My cat usually does it because he thinks there's a moth or bug up there.

There might have been a shadow on the ceiling or maybe even some critter or a bird walking around on the roof.
The other night Elliott was staring and screaming at the ceiling in out Living Room...I couldn't see anything at first.
After a closer look there was a tiny little fruit fly sitting up there.