Agreed. I hate to waste a drop myself, but tap it and squeeze a few SMALL drops out; actually, you will lube the
needle which may inject easier, but you wont have air.
I hear alot of whining about pain or burning, being sore, and what not. Now, Im fortunate that my wife is a nurse and does me, so other than a tiny initial sting, if that, I feel nothing. EVER! Even after, no tender tissue, pressure, burning, itching, etc... She says that air can cause pain, from mild discomfort to sheer agony... depending on how much and the person, or the site.