Today’s Bizarro:
This isn’t really a pun conveyed wordlessly — the caption “First sign of spring” is crucial to understanding the cartoon — but the pun is conveyed indirectly. For the cartoon to work, you have to recognize the figure behind the tree as Batman’s young sidekick Robin (named after Robin Hood, but given a red shirt to suggest the American robin’s red breast), and you need to know about the first robin as a sign of spring:
The Robin is considered a symbol of spring. A well-known example is a poem by Emily Dickinson, “I Dreaded That First Robin So”. Among other 19th-century poems about the first robin of spring is “The First Robin” by Dr. William H. Drummond, which according to the author’s wife is based on a Quebec superstition that whoever sees the first robin of spring will have good luck. (link)
