From the Society for Editors and Proofreaders’ Facebook page, passed on by Edith Maxwell, this Judy Horacek cartoon:
Apostrophe Man on a campaign against the greengrocer’s apostrophe. Unfortunately, Apostrophe Man could use the aid of Comma Man, to insert a comma setting off thank you. (As printed, the punctuation matches the intended prosody of Apostrophe Man’s sentence, even though the punctuation is non-standard.)
On the cartoonist, from her website:
Judy Horacek is an Australian cartoonist, artist, writer and children’s book creator. Her cartoons have been pinned up on doors and walls all over the world. She is also sometimes a visiting artist for school children and an after-dinner speaker for grownups.