青梅竹马都是奇葩
[qīng méi zhú mă dōu shì qí pā]
The phrase expresses a rather cynical view that those who grew up together and were childhood sweethearts turn out to be odd or different in ways not expected, which can lead to amusing or peculiar outcomes. 'Qing Mei Zhu Ma' (青梅竹马) originally means childhood friends who become lovers.