A typical lethal dose of caffeine is 10 grams, although people have
survived up to 24g.  A shot of espresso has 100mg.  So unless you have
unusual tolerance, it ought to take a nice round 100 shots, or say 50
double cappucinos, to get to that big cafe in the sky.

      According to the National Soft Drink Association, the
      following is the caffeine content in mgs per 12 oz can of soda: 

      Jolt                    100.0
      Sugar-Free Mr. Pibb     58.8
      Mountain Dew            55.0  (no caffeine in Canada)
      Diet Mountain Dew       55.0
      Mello Yellow            52.8
      Tab                     46.8
      Coca-Cola               45.6
      Diet Cola               45.6
      Shasta Cola             44.4
      Shasta Cherry Cola      44.4
      Shasta Diet Cola        44.4
      Mr. Pibb                40.8
      OK Soda                 40.5
      Dr. Pepper              39.6
      Pepsi Cola              37.2
      Aspen                   36.0
      Diet Pepsi              35.4
      RC Cola                 36.0
      Diet RC                 36.0
      Diet Rite               36.0
      Canada Dry Cola         30.0
      Canada Dry Diet Cola    1.2
      7 Up                    0

      By means of comparison, a 7 oz cup of coffee has the following
      caffeine (mg) amounts.

      Drip                    115-175
      Espresso                100mg of caffeine   
      1 serving (1.5-2oz) 

      Brewed                  80-135
      Instant                 65-100
      Decaf, brewed           3-4
      Decaf, instant          2-3
      tea, iced (12 ozs.)     70
      tea, brewed, imported   60
      tea, brewed, U.S.       40
      tea, instant            30

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