Ever since the beginning of the history - people who didn't read the manuals caused trouble. Well, they might not be into reading a manual of couple of pages but at least they should understand the short reference: RTFM - Read The F*cking Manual.
Often need to tell others: "RTFM!"? Get the shirt, save the words.
This quality T-shirt with an embroidered (not printed!) text is very lively and eye-catching. It differs from a regular printed label in its quality, durability and its trendy and expensive appearance.