h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

My hometown Houston Astros currently have Roger Clemens pitching for them, who at 6'4" tall and 220 lbs. is one of the more aggressive people on the planet. From an ESPN writup of the 2000 World Series when Clemens pitched for the Yankees:

QUOTE

In their first matchup since Clemens beaned Mike Piazza in July, Clemens came close to hitting Piazza again -- this time with the jagged barrel of a broken bat.

END QUOTE

More here:

http://sportsillustrated.cnn.com/baseball/mlb/2000/world_series/news/2000/10/22/piazza_clemens_ap/

The Astros, while never having made it to the World Series, have had some memorably aggressive pitchers.

Frank McCourt, the Irish author of "Angela's Ashes", described in an editorial the time he first saw a major league pitcher on a TV in a NY bar. Looking up at the big screen, he was shocked by the "gunslinger's" eyes on the huge man as he stared at the batter. "Who is that?" he asked his friends. They looked up and said, "Mike Scott, Houston Astros." (6'3", 215 lbs., and who once threw a shutout to clinch the division title) McCourt said that from that moment on, he was a baseball fan.

But he had already missed most of Nolan Ryan, who at 6'2" and 195 lbs, intimidated mostly with 100 mph fastballs. Still, Ryan was not exactly bashful towards batters, one of whom took exception to a "brush back" pitch and rushed the mound. Ryan simply got him in a headlock and proceeded to bang him on the top of the head until both benches arrived.