No more monkeys jumping on the bed! (unless they're professionally trained and have years of experience)
Reuben Reynoso gets paid to jump on mattresses, day after day, mattress after mattress. The McRoskey Mattress Company in San Francisco has been making mattresses — and having people jump on them — for 112 years, since before the 1906 quake. [more inside]
The world record for human mattress dominoes has been increasing exponentially for the last few years. From 41* to 159 to 256 to 380. But China definitely dominates the world record, if mattresses aren't required.
StreetMattress.com - Much like "found art", this site chronicles the phenomenon of abandoned mattresses, and finally gives the public a forum on which to comment on them. Some if my favorites are here, here, and here.