In my ealy days of brewing, I used a blow-off tube with the end of the tube submerged in jug of water. One time I put a good splash of bleach in the jug with the water because I was expecting a lot of trub from a very heavy batch of beer and the blow-off water tends to get messy and gross after a while. The wort was also a tad bit warm when I pitched the yeast (~80 F), so I put he whole assembly in the fridge overnight to let it cool. I am sure many experienced brewers that are reading this are chuckling right about now. (For the uninitiated, when I opened the fridge the next day, all of the bleach water had mysteriously dissapeared).
I still prefer blow-off tubes to airlocks (at least in the primary stage). Only since then, I make sure the volume in the tube is less than the volume of water in the jug.
Honey Badger Don't Care ಠ_ಠ ~=[,,_,,]:3