All of us on twitter from time to time do an awful spelling mistake which alters the whole sense of the tweet, or realise when seeing it online that it doesnt make sense. I once tweeted an event and the wrong time, so please dont panic. I find it easier to remove tweets on my netbook then on my mobile phone as i have more manual control. So have done a screen shot for you to show u where to do it. Do a follow up tweet with 'it should have read rhubarb , rhubarb ..' if still anxious.