Picture of Hide keys in PVC pipe.
This is a sneaky way to hide keys inside an old piece of PVC pipe. (credit to Sean Ragan for the idea, just helping to distribute)

Step 1: Cut your pipe

Picture of Cut your pipe
Using a hacksaw (If you wish you can use powertools such as a table saw, but make sure you wear a good quality dust mask to protect against airborne particles) cut a length of PVC pipe to be long and shallow along the axis as shown in the picture.
wow know i have use for all the left over pvc pips cutting i have!
thank you 4 the idea :)