A: My pants have a hole in the front pocket. B: You shouldn't carry pens in your pocket. A: Yesterday a pen fell through my pants onto my shoe. B: Lucky for you it wasn't a sharp knife. A: Who carries a sharp knife in their pocket? B: Criminals, of course. A: Anyway, I have to fix the hole. B: You can sew it up or use an iron-on patch. A: Tell me about this patch. B: The patch has glue. The hot iron melts the glue so the patch sticks on. A: That sounds a lot easier than sewing. B: It is. But after about ten washings, the glue washes off.