Throwing of beverage bottles on to the sports field by an angry crowd:
there was an incidence of this sometime in the late 1990s here in the
U.S. It created news headlines.  When was it and at which game? What triggered it?

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Request for Question Clarification by jackburton-ga on 23 Mar 2004 09:31 PST

Here's part of a report that was printed by The Associated Press in 1999:
   
"Eighty-one years of anger and frustration rained down on the field at
Fenway Park on Sunday night.
Fed up by the Bambino's curse, Buckner's curse and more blown calls by
umpires, Boston fans interrupted New York's 9-2 victory by throwing
bottles on the field as the Yankees took a 3-1 lead in the AL
Championship Series.
While the Yankees moved within a win of their third trip to the World
Series in four seasons, the game will be remembered not for their
victory, but for the fan ugliness that caused an eight-minute delay in
the bottom of the ninth inning after New York had broken open the game
with six runs in the top half."
(..)
   
Does this sound like the one?

Another ugly scene was in Cleveland in late 2001.  In this case, the
crowd was upset about a bad call reversal.  From what I understand,
this incident was the final straw that caused most stadiums to either
ban bottles (both glass and plastic) or require the vendor to not let
the customer have the cap.  The cap banning logic is that without a
cap, the bottle can't fly as straight and far when thrown.

Here's the Brown story:
http://www.sptimes.com/News/121701/Sports/Bottles_fly_in_Clevel.shtml
http://espn.go.com/nfl/s/2001/1218/1297527.html

1999 MLB Playoffs ALCS, Yankees Vs. Boston GAME 4

It was triggered by a bad call. 

Here's the link

http://sportsillustrated.cnn.com/baseball/mlb/1999/postseason/championship_series/alcs/news/1999/10/17/yankees_redsox_ap/