Slot Machine 
To dream of seeing or playing a slot machine indicates that you are being too frivolous with your finances. It also implies that you should focus your efforts on a task or project that will create more important results.
Ventriloquist
To dream of a ventriloquist is an indication that someone around you is being less than honest with you. They are hiding a secret from you.
To dream that you are a ventriloquist is an indication that you are treating those that trust you badly. You are lying to them and hiding things from them.