I just today found out that the “press F to pay respects” meme is

Press F to pay respects - Chess Forums

All the emotions, Press F to Pay Respects

Press X To Pay Respects

Press F to pay respects - 9GAG

Press F to pay respects : r/memes

I'm Too Afraid To Ask, Press F to Pay Respects

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Call Of Duty's Press F To Pay Respects Meme Gets A Nod In MW3 Zombies - GameSpot

Press F to pay respects meme Pin for Sale by Your-Sensei

Where Does 'Press F to Pay Respects' Come From?

Press F to pay respects : r/ffxiv