The monitors for both my desktops are 21 inch and both computers are also hooked up to the big screen tv in my bedroom.
Two of my android tablets have a mini hdmi port and I have the cables to plug them into any big screen tv that has an hdmi port. (Don't they all?)
I can put some movies on my tablet, go to the living room, connect it to the big screen tv in there and have the movie playing in the background while I do housework or something. Which for some reason I find that amusing.
Also I have a home network setup where my desktop computer can act as a server and I can use my tablet to wirelessly access all the movies on my bedroom computer (not just JAV) and I can go to another location, even away from my house and watch movies, concerts etc... on someone else's big screen tv.