I always spill water while doing water changes !
Short story:
A friend of my daughter, set up a new 180 gallon saltwater tank. Their first. After one week of have water, sand and live rock in the tank. The father comes home from work at noon to find the tank empty of water. The tank was on a new wood floor. The good news was the mother was out of town visiting relatives. The father had a mess ! Thousands of dollars in reflooring repairs. The mom returned from her trip to notice the tank was a lot smaller from when she left. (Replaced with a 65 gallon) The father told her the big tank was way too much trouble, so he exchanged it for a smaller one.
