It's that time of year again, so I'm putting this back up. If you have a problem with squirrels, and who doesn't, this arrangement is just the ticket.
Lowes sells the pipe, 4 in ABS, pre-cut to a 4 foot length. I'm sure you've got a bucket around the house somewhere.
Fill the bucket with water, and smear some peanut butter about elbow-deep down the inside of the pipe. The bungee cord in the top picture is to keep the rig upright. Check daily. This thing is a black hole for the little rodents.
The low-buck version of this, you buy a pipe cap for the pipe, and glue it on to one end. add about a foot of water to the pipe, and check daily. If you're feeling soft hearted, skip the water in the pipe, and get a spare cap. When you get one, cap the top, and drive him far away.
Speaking of sending them far away,
This rig entices them to crawl up the barrel, which then tilts back, hitting the button that opens the valve, that releases the air compressed in the lower pipe, and inaugurating your very own backyard space program. More details here, and here.
You can, of course, combine the two. Place the gun up against the fence until you get one, charge the thing from your compressor (you do have a compressor, right?), then shoot the squirrel straight up and let the dog catch it on the way down (you do have a dog, right?).
Dogs comment: "Worst tasting duck he ever brought down."
Update: This is a popular post, so here's some additional info. It's now June 8, and I'm getting 5-8 squirrels a week. The problem is what to do with them since trash day is Friday AM and I seem to get one Fri PM almost without fail. Homers Bucket, from Home depot, can be had with a snap-on lid for under $5. Put a kitchen bag in it to collect the bodies, and keep in a shady place. Come trash day, close the bag and out they all go.