Promise them that you’ll take them out for a cold one after moving.
Give them that odd table or item that they love.
Order some pizzas. Food always helps.
You know Becky? My girlfriend’s best friend… She’s going to be there. Invite the girl that they like.
Yo Bro, you want to go to the gym? Come over my house on Saturday at 8:00 am.
Call your friend and say: My house is falling apart. Everything is coming off the shelves… literally.
When they move out you’ll return the favor.