A good old proper pint mug with what looks like a pint already in it. No matter from what angle or how much you've drunk it will still look like a full mug of beer.
You don't have to drink beer in this mu, use it in the office for you tea or coffee. Great for those that like a pint but have to go to work, at least it looks like a pint mug.
For tea and coffee not just beer.