Bucket or 55 gallon drum, rod and coke can. Cut out top and bottom of coke can. Place rod through coke can. Attach rod on top of bucket or drum. Put cheese or PB in middle of can. When the rat runs across the rod and jumps on the can. The can will roll and he will fall in bucket. This is how I was taught and has worked at grandads barn for years. But if you wanna have some fun go the pellet gun route.