The Walt Disney Company is celebrating its 100th anniversary this year with a series of commemorative
medallions called "100 Years of Wonder"... my daughter was at Disneyland last week and brought me back
one of the coins (apparently there are many different varieties)... this one features the Hitchhiking Ghosts
from Haunted Mansion (front and reverse):

And two other round things that may be of (non-chip collecting) interest... the original Red Robin logo from
the restaurant chain's founding in 1969... and a Knights Templar medallion from who knows when...