The Arizona Diamondbacks had to threaten to boot people from the World Series on Tuesday night ... and it's all 'cause they wouldn't stop hurling paper airplanes onto the field.
The wild scene happened late in the Rangers' blowout win over the Snakes at Chase Field in Phoenix ... when fans got so bored with the rout on the diamond -- they decided to fold up papers and chuck them from their seats.
Several of the makeshift planes actually made it all the way to players' feet ... and it happened so often throughout the evening, the stadium's public address announcer had to warn people that if it continued, they'd be thrown out.