“Aha!” is, quite simply, a song about hypocrites and what they do behind closed doors, with the song split into three sections, each about three different individuals who are guilty of hypocrisy.

The first section is about a vegan who boasts about the benefits of his lifestyle, while secretly sneaking in non-vegan food when nobody’s watching him, and is based on the true story of a man Imogen was seeing at the time. The second describes someone who constantly brags about being environmentally friendly but drives a car that runs on gasoline, which contributes to global warming. The final part sees an amiable overachiever who everyone trusts turn out to be a serial killer, ultimately betraying their trust.

The song was covered by a capella group Pentatonix for their self-titled album and was revamped by Heap as part of the soundtrack of Harry Potter and the Cursed Child.