In how many ways can 5 different keys be placed on a keychain?  (Two arrangements are considered the same if one can be rotated or flipped to be identical to the other.)
There are $5!$ ways to place the keys on the keychain, but we must divide by 5 for rotational symmetry (5 rotations for each arrangement), and by 2 for reflectional symmetry (we can flip the keychain to get the same arrangement).  The answer is $\dfrac{5!}{5 \times 2} = \boxed{12}$.