The hours after New Year's Eve are hardly the best time to pose a brain-teaser. But, for those no longer suffering through the fog of a hangover, what makes Andy Carroll and Christian Benteke stand out among the top 15 most expensive signings in Liverpool's history?
Not the most difficult question, true, but credit to those who deduced the pair are the only members of that exclusive club not to be part of Jurgen Klopp's current squad.
Cody Gakpo became the latest name added to the list when he last week agreed a move to Anfield from Dutch side PSV Eindhoven in a deal that could ultimately cost Liverpool around £44million.
