I went on a date to an art museum that had a Monet that literally stunned me. I think just holding their hand and staring at 'Irises by the Pond' is the most I have ever felt moved by a physical piece of art in my life. It felt transporting and beautiful and I nearly cried.

Alternate answer: While looking through a bunch of magazines and newspapers for research in an archive I stumbled upon Cindy Sherman's 'Untitled #86' from an interview with her and it enraptured me so much I got completely distracted from my original search and purpose for researching and photocopied the whole interview and later bought a book of her photography.