Anyone else ever given themselves a heart attack?

[InfinitiveDivinity]

This happened about a year ago but still. Pairings for round 3? 4? Doesn't matter, pairings for a later round at a Modern FNM had been posted, I went to sit down with my opponent and couldn't find my Mill deck. I should also mention that the entire deck minus a few lands and fetches are foil, including my sideboard. So I start freaking out. I had just picked up my final 2 Mistys of my playset, which were $100 at the time, and the deck also had a Tarn in it, which was also $100. After about 3 minutes of me frantically searching my backpack and all of my deck boxes, my buddy who I had played the round before places my deck box on the table. His deck had the exact same box and he had grabbed it on accident. That was horrible 😖