I need help with a text to my boss. He is having a big party this weekend, and I really don't want to go, because my clumsy self will be that person who stumbles and spills red wine on someones expensive white dress. Just yesterday I was looking  at my phone and turned my ankle on my own staircase! I need a text that I don't lie in, and gets me out of going to the party without making my boss mad. I don't want to email since it is not a work function, so a causual text is best I think.
Hi {insert boss's name}, I am really sorry for the short notice, but I will not be able to attend your party this weekend. I was stupidly looking at my phone while walking down the stairs and twisted my ankle. It is still giving me trouble and feels weak, so I think it is best for me (and your furniture lol) if I stay home and prop my ankle up until I can walk on steady feet again. I hope you have a great time, and I will see you next week {insert your name}.