if you own a rabbit after a while you'll begin to learn about its individual moods and habits, but there are a few distinctive signs that all rabbits seem to use.  This will be a quick primer in how to tell the mood of your rabbit.

"Thump"

Anyone who owns a rabbit will someday hear their rabbit Thump.  Now this isn't the sit down while pounding the ground thuimping that appeared in Disney's movie Bambi.  Instead to Thump a rabbit will put both front paws on the ground and then hit the ground with both of their hind legs.  It creates a very distinctive "Thump" sound.  (although if done on the bottom of a metal lined cage you get a ringing sound.)

Its speculated that in the wild rabbits use this to warn other nearby rabbits of potential danger.  Now your average pet rabbit doesn't have predators to warn others about, so this thump usually becomes a method of expressing displeasure or annoyance. Witht he rabbits I have had  Arimi used to thump any time she was returned to her cage after.  Lain has been known to thump if there is a high level of stress in the air.   I've also seen the rabbits thump when smoke from a nearby fire entered the apartment through an open window and they detected it.   Being thumped at shouldn't be a signal to be concerned.  If you respect your rabbit they won't make this a major issue.

Ears

The ears are a quick way to telling how your rabbit feels.  If a rabbit is relaxed the ears will be held upright.  However a frightened or upset rabbit will lower the ears until they are flat against the back of the neck.   If you are handling your rabbit and you see this happen, it might be time to return them to their cage.  They need a break.

Eyes

This is one of the simpliest ways to tell how a rabbit feels.  Frightened rabbits will roll their eyes.  If at any time you can see the white part of your rabbits eyes, you have a very frightened rabbit and you should return them to their home to rest. 

Lying down

A very relaxed rabbit will lie down and stretch its legs out.  This will only happen if the rabbit feels safe and secure.  If your rabbit is lounging it often is best to allow it to relax.  If you have a new rabbit, or have just moved it into a new cage, you can tell that its becoming accustomed to the new environment when it first lies down to relax.

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These are all rather basic actions that rabbits take to show you their moods, but they are significant.  Rabbits are not very expressive animals, so you have to watch carefully and get to know your rabbit in order to learn mroe abuot them.  But these few simple actions are a good way to begin that process.