The shimmering, wavy, mirage-like effect that halos the heads of the demon-possessed in San Jose, as it appears in the dark with backlighting:
A video of this effect in the daylight, as shown below, and as discussed in SCIENCE | Sucker demons connect demons to humans for 'possession':
In the former, the light reflecting off the wall from behind me is bent by the transparent crown, which, as it undulates, diffracts light similarly to the edges of a prism; in the latter, the same principle, although, at one time, I thought it was light refracted by the heat of cloaked sucker demon.
My inevitable demise, daily.