Question: What is the highest Week with the Opponent Buffalo Bills?
SQL: SELECT MAX("Week") FROM "2-17781394-1" WHERE "Opponent" = 'Buffalo Bills';

Question: Which Opponent has an Attendance greater than 14431 during Week 3 at Bears Stadium Game site?
SQL: SELECT "Opponent" FROM "2-17781394-1" WHERE "Attendance" > 14431.0 AND "Game site" = 'Bears Stadium' AND "Week" = 3.0;