Always pay attention

My worst was on my CJ-7, I had replaced the oil pan gasket of course draining and removing the oil filter before hand, I had replaced the drain plug but some how I forgot to put on the oil filter, upon starting the jeep I heard a loud noise from the motor so I shut it down right away, it took a matter of seconds to dump half the oil from the motor on the ground and in general all over the place. I guess what I learned from that was that my jeep had really good oil pressure