Heh. I love that before I even clicked on the link, I correctly predicted what the Heardle song would be from your comment.Granted, I've been on the internet during the past decade. Many people would have predicted the same.
I've been on the internet for over 2 decades and it still got me... I didn't expect a prank from a daily game and they definitely did it right.
Just so I don't sound too smart, unlike you, I only went to Heardle after reading DanHoelck's comment noting it was a prank. That was a massive hint. The way they executed it on the page confirmed I was correct so I didn't even bother to click the link.
I play heardle every morning (7am) with my coworkers. Being it was early I didn't think about what day it was and was properly fooled.