This site claims to convert boring units to real objects - as you type! Well, it's a very good idea (did you ever prefer to have someone describe 40,000 feet as "28 Empire State Buildings"? ...no?), but the execution is slightly flawed. For one thing, it doesn't convert weight (pounds, grams, etc). For another thing, it tends to describe extremely tall heights in terms of "Mont Blancs" (It's a mountain - I checked).
You can certainly waste a few minutes there, and in the end - isn't that what this site is all about?