Did you realize a lava lamp is really about oil and water not mixing well? While the results look interesting in a lamp, when a parent and child don’t get along well, there is a lot of unhappiness. If you have children, there is a fairly decent chance you will have what seems like constant conflict with one of them.
It may feel like no matter what you say, this child gets upset. Or maybe, you have found this child seems to be able to easily and constantly “push every button” you have. You may find most of your time with this child is spent in some sort of conflict. Most likely, you have decided this child is “stubborn” or some other negative adjective.