English has no standard punctuation mark or typographic style to show sarcasm or verbal irony. This lack has inspired a whole menagerie of proposals over the centuries, including backwards question marks, upside-down or zigzag exclamation marks, and left-slanting typefaces (‘ironics’, ‘Sartalics’). Some have gained niche usage, while others faded more or less instantly: only the winking smiley ;-) ;) has become widespread, and only in informal text.
I notice the gap sometimes when chatting online, for example when I misinterpret someone’s tone or they misinterpret mine. A tongue-in-cheek statement can easily be taken at face value if the reader doesn’t know the writer well. This happens often on Twitter, where strangers’ statements can spread without much pragmatic context.