Ha, ha... Ding, I use the "Jeans" method of weight management too.
I only get weighed at the hospital.
My fastest weight loss was while I was in hospital before Christmas. 12kg (26 pounds) in 3 days. It sounds extreme, but It was just after I had my operation and I went through a bowel obstruction. I didn't eat for 3 days and as vomiting up bile at a rate of 1 litre every 3 hours. I put 6-7kg back on fairly quickly again and I've stayed at 83kg (13 stone) since.
The oddest thing, I was vomiting so much fluid, yet I hadn't drank/eaten anything at all.