Thanks Everyone,
Stevesmi, He went in at the top of the glute. Like, if you drew a horizontal line, it would run right across the top of the crack/tailbone. He stuck it into the bulge or peak of the muscle on that line.
Anyways, oddly enough (it's only been around 24 hours), but I actually think I can tell its in my system. Most likely placebo or something, but I wasn't tired or lethargic as I usually am, last night.