Does growling at my younger brother count? He did get pretty freaked out.
I only work with insects, not mammals, birds, fish, reptiles, or amphibians. It can be very hard to get permission to scare or harm animals. There are very few rules about insects though, so I can experiment on them any time.
I have a science joke for you
Q. What do you get when you cross a cow with an octopus?
A. A very angry letter from the ethics committee and an immediate loss of funding.