To be clear, the boys of One Direction don't always act all silly on Instagram.
Case in point: Zayn Malik expressing support for Palestine.
Or when Niall Horan claimed to have stumbled across Miley Cyrus' leggings backstage at Met Life Stadium in New Jersey and wrote on Instagram:
"@MileyCyrus you left these in New Jersey! They are comfortable, not gona lie #twerk #tongueout."
Of course, Cyrus hasn't performed at that venue in quite some time, so Horan may have been confused.
But he did elicit a Twitter response from Miley herself: "@NiallOfficial f*ckkkk yasssss."