This isn’t the first time energy stocks have zigged while everything else has zagged. It seems to be a feature, not a bug.

Stock futures ticked lower before markets reopened Friday morning amid uncertainty among investors over the Middle East and whether the United States was about to get directly involved in the Israel-Iran conflict.

The S&P 500 typically fully recovers within a few weeks of a major geopolitical shock such as an invasion or attack, Deutsche Bank Research found.