So I'm a relatively new tech. I've been finished school and working for <1 year, and really haven't seen anything collected too horribly (so far). As far as poor collections go, the worst I've seen has been some leaky blood gasses, or a loose cap on a urine cup.
But, our lab did receive a venous blood gas that was drawn from a penis fairly recently (a penis blood gas, ha!) I happened to be coming in for an evening shift when my colleague was calling to ask the charge nurse about the crazy results (person had an erection for way past 4 hours) and I heard her go, "Hi, I'm calling about a blood gas we received for [patient] ... wha ... OH!"