Professionally ignore people with style.

I am temporarily unavailable and spiritually on airplane mode. I am offline for a short period and letting that be enough information. Last-minute revisions are still last-minute revisions even if you add a smiley face. I will get back to you once my out-of-office era concludes. If this cannot wait, use the pre-arranged urgent route rather than hopeful emailing. Your patience is the real productivity tool here.