Since 1987, illustrator Martin Handford's
Where's Waldo? (
Where's Wally in the UK) books have challenged the pattern recognition skills of children and adults. In the many books featuring Waldo, Handford has occasionally hidden strange if not a touch scandalous images. Adrian Beiting of of the geekery blog
Topless Robot has compiled nine of the oddities, such as an Aztec human sacrifice:
Link | Images: Chadwick House Publishing