Tolerance. It’s one of the unexpected traits you acquire as a new parent. The trouble is, it’s not permanent. When you exit certain parental stages, you revert to your former inadequate, selfish inclinations. This chart proves (what I can only surmise) is a very universal (and hypocritical) hypothesis.
There’s no such thing as friendly cries when you’re flying the friendly skies. Unless, that is, you’re the one holding the baby.