Being known as somewhat laid-back person, my fav is:
"Ice-Box" Chamberlain
also .....
Georgetown's old guard "Sleepy" Floyd (who actually got the name from his slow play at 2nd base).
.... and I forget the name of th SF 3rd baseman who was called "Tin Man" for his steel heart approach to life.
(((and for those pshychotic baseball fans: Terry "The Terror" Larkin)))