Black holes are very fascinating. We all know that you couldnt survive, or not at least in your current form, entering a black hole but what if you could? The gravity there is nearly infinite therefore time would either be completely stopped or just tick by so slowly that it seems so. Barring the "spaghettification" you would go through it would be quite interesting to experience being "paused". Although you wouldnt realize it of course :P
EDIT: The only real flaw of using a rubber sheet (I always used a bed sheet as an example lol) and marbles to explain space time is that in reality space time isnt 2d. You have to somehow imagine that same concept but in 3 dimensions to really get a good picture in your head of the concept.
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