Friday Chem Joke

  Fe Fe Fe
      \ | /
Fe --*-- Fe
      / | \
  Fe Fe Fe

A ferrous wheel

HI
  \
   Ag
  /
HO

Hi Ho Silver!!


And for the non-chem's:
Two parrots were sitting on a perch. One said to the other, "It smells fishy around here."
Did you hear about the polymorphic tractor, it was driving down the road and then turned into a field.