Seconding Zombies, and also wasps.
Some other ones:
Fear of or aversion to things with lots of holes in them, or patterns of clustered spots, is called Trypophobia, and it's way more common than some people realise.
Some people are scared of flies. They might have seen an adult freaking out about flies landing on food, or been told "flies poop and lay eggs on food" as a child and developed a fear of them.
Balloons are phobia for some people, because they're like "a thing that may make a loud, sudden noise at any moment" kind of thing.