Only two of my pregnancies my waters broke...one was while chatting to my homebirth midwife and I felt a little pop and thought I wet myself so went to the toilet but I soon realised that it was constantly trickling out...and getting stronger.
The second was while i was sitting on the lounge on the computer and I felt a large pop and heard a big splash as they hit the floor...I was 26+6 weeks...so a little bit of panic followed