Final answer:
In 'McTeague', Marcus challenges McTeague with a bet that he can't fit a billiard ball in his mouth, resulting in a gambling agreement by placing a quarter each on the table.
Step-by-step explanation:
In McTeague, Marcus bets McTeague two bits (a quarter) that McTeague cannot do a particular feat that he, Marcus, can. Marcus demonstrates his ability to cram a billiard ball into his mouth and shut his lips over it. The men respond by each putting a quarter on the table, indicating their agreement to the bet.
This scene showcases the characters' propensity for engaging in seemingly trivial challenges, which emphasizes the simplicity and roughness of their lives and interactions.