This is a very, very, very simple instructable. And was discovered by accident.
Step 1: Buy bucket and put seed in the bottom.
What happens is the hungry, little mouse (not to be pitied because his kin helped propogate the black plague) smells the vittles in the bucket. Then it climbs up something (in my case, Christmas boxes) and leaps into the bucket (similar to the way a corpulent person flings themselves into the buffet at Ryans Steakhouse). Once the mouse lands at the bottom of the bucket, it realizes it can't get out - you will be allerted to your prey by the fact that it will jump repeatedly trying to get out.