I'm assuming that the haunting is because I had a vendetta against the haunted. In that case, I'd make their life miserable in the most subtle ways, including but not limited to:

• Move their furniture half an inch at random so they keep stubbing their toes.
• Make their clothing get stuck in doorhandles.
• Loosen the knobs on their drawers.
• Loosen the screws on the handles of their pots and pans by an eight of a turn.
• Shift things in their cupboards so that something falls out every time they open them.
• Damage the gaskets on their windows so that there's a draft and constant whistling sound.
• Reopen their resealable packages a little bit so the food spoils faster.
• Make their toilet leak, but only when they're sleeping.
• Pack lint into their phone's charging port so that their charger never plugs in snugly.
• Unbalance their appliances so they rattle/shake.
• Slightly unbalance their car tires.
• Loosen fasteners in their car so it produces annoying rattles.
• Make their pens leak.