If you miss your chance to say this the day before, you can always go with "I haven't showered in a whole year". If you're lucky, someone will point out your wording, which is when you get them with the joke reversal.
If you miss your chance to say this the day before, you can always go with "I haven't showered in a whole year". If you're lucky, someone will point out your wording, which is when you get them with the joke reversal.