Bionicle (obvious, though lately I haven't been into it, for reasons that are also obvious), Transformers (Movies, WFC/FOC, Prime), Halo, and some other stuff.
Oh, were you expecting this to be longer? It was before, but it was also out of date at that time. So, which would you prefer? :P
The Flood Infection Forms in Halo look like popcorn. (And pop like it when shot) Add that to the fact that the Flood used to scare me a bit, (shock factor first time I saw them) and...well...