What happens if I send an incorrect keyword to short code 388? If you send an invalid keyword to 388, you will receive this SMS notification: “Invalid Keyword. Please text COMEDY to Subscribe or STOP to Opt Out.” Related articles What is Comedy Line? How to subscribe to Comedy Line How to opt-out of Comedy Line? How much will I be charged for subscribing to Comedy Line? Can I listen to the same joke multiple times on the same day?