April Fools!
This minor non-holiday gets a tee shirt at the Sega Shop in 2019...seemingly just for the chance to say 'made ya look!'
This silly shirt features a smeared-on-purpose distorted art of Sonic. He's meant to look in the middle of 'speeding away', such that the image is blurred/smeared. What it actually looks like is one of those 'in-between' shots in animation where the character is halfway between a toony movement & ends up looking like this.
This is a very strange concept to make it to a shirt...and certainly there's not anything like it. (The only other item being the tilted/distorted mug) Its problem is that it is costly, with adult sizes at 30 dollars.