Holed up at home, I was distracting myself by shining my green laser pointer around. Something particularly interesting happened when I pointed the laser at a reflective black plastic surface. The reflected beam would show first as a dot, but rapidly start to spread out and achieve a sort of halo shape. Waiting longer yielded a sequence of concentric almost-rings, and reminded me a lot of the diffraction patterns I learned about in undergrad physics.
I assume the laser is actually heating and warping the plastic here, but I'd love to hear a more detailed explanation if someone has one.
Edit: Yesterday I set up the laser to point at a spot on the surface, which is the casing of a fan. As you can see in this picture, it actually altered the surface after several minutes. It didn't feel warm at all, but it seems clear to me that there's some heat-driven effect.