Checkmate

You sayin' a pizza wouldn't make a curved shadow if lit from the right perspective?

Checkmate, globe fundie.

With just your eyes... And a big lake or sea... And a ship... And the knowledge that water lies level.

Similarly it's not exactly understood from birth that lunar eclipses are the earth's shadow.

You gotta work all these things out and make more complicated observations than just looking at the horizon.

The moon rotating at the same rate as its orbit and always facing earth could be used to reinforce the convex shape idea.

The shadow thing could also be from a disk. I mean, it's not, but disks also make round shadows.