Never cut 18 inches off of a swimming pool "noodle" (anyone with kids under 10 will recognize this latest aquatic toy), wittle the end to a sharp point, attach a string and a ring at one end, and then insert it in your rectum.
Especially not if your um....purpose....for doing so requires you to push the noodle to an internal depth at which the artificially pointy end threatens to puncture a lung.
Because the aforementioned action will preclude your best-laid plan of pulling the noodle out with the string-ring combo post um....purpose...and will result in an ER visit that I assure you is no more comfortable for the staff than it is for you.