In response to this question:

I know some people were taught in school that it is, but others (including myself) were taught that 0 is neither even nor odd.

My CS173 instructor (not a TA, the actual instructor) replied:

Hmmm… I sincerely hope that if someone actually taught that, that they
were, as a group, suffering from mass hysteria, brought on by questionable
teaching methods such as watching Pokemon reruns at high speed. Please, I
hope. peeka peeka.

I don’t feel teachers should be allowed to use the phrase “peeka peeka” for two reasons. (1) it’s freaky and (2) it’s spelled pika. I’ve got 5 to 1 odds that he freaks out and kills either a student or his common-law husband by the end of the semester.