Juan and his friend Carlos are visiting the house of Carlos's business partner named Jack O'Gramme, who is a famous manufacturer of metric-system measuring equipment. Carlos is conducting a meeting in the parlor and Juan is leaning against the wall outside. Suddenly, Juan hears a loud "thump" from inside the parlor, followed by the shattering of glass.
Rushing into the room, Juan sees Carlos lying on the floor, a set of weights near his head. A window is horrendously shattered, and Jack is nowhere to be seen. Juan rushes over to Carlos to see if he's alive. It's a gruesome sight; a heavy-looking black cylinder marked "1kg" is covered in blood, and Carlos's head is visibly dented.
Juan says, "Carlos! Carlos, are you OK?!"
Carlos, miraculously having a bit of life left in him, responds, very groggily, "Carlos... the deal went bad... he got me good..."
A moment passes. "I don't have much... time left... I need you to do one thing for me... after I'm gone..."
Juan, on the verge of tears, says "Wh... what is it, Carlos?"
Carlos coughs a little, and says back,
"Avenge me... Juan, kill O'Gramme..."