By all means, say something. A single playing card was seen on the sidewalk, either missing its 51 friends or planning an escape. The jack of clubs is about the lowliest of the face cards, on par with the jack of spades, neither significant in popular card games nor culture (like the jack of hearts). Also known as the knave, servant of royalty, the jack, like this one, has its roots in France, where the face cards were associated with historical or mythological characters. The jack of clubs is Lancelot, from Arthurian legend.
(The black spots on the sidewalk, in case you don’t know, are the remains of chewing gum.)