Starter hikkyavengings:
>slash the tires on normos bikes and cars in the early hours of the morning
>normos don't get to work in time
>basics
>throw glass bottles on the street
>also hide broken bottles under car tires of normos cars on the parking lot
>write improper and insulting remarks on public places
>on public toilets always piss on the ground in front of the toilet seat
>go to the store
>open the packages of easily spoiled foods
>try to make it so the normos don't spot it immediately and they carry them home
>you can also steal them, let them rot at your house and them put them in normos post bins as a present
>play high frequency sounds extremely loud in your apartment so the neighbours animals go crazy
>if you find a shitdog tied down outside the grocery store, cut it lose and let the poor creature run free