David Cameron faced an hour long stern-faced grilling at Sky News last night, while Michael Gove faces his tonight.
It's all getting a bit serious.
But overall it's been a ridiculous EU referendum campaign at times. So let's pause and reflect on some of the lighter moments of the run-in, when the collective responses were predominately: "Did that just happen?".
1. When a vote leave sign was vandalised and #VoteBeaver became a movement
Despite the Facebook protests of Felix Aubel, an activist for the Welsh Conservative Party, the message provoked more humour than sympathy.
Best of all, #VoteBeaver began trending on Twitter as people began pledging support.