My husband and I laugh over the same things too! He's not a big guy and I have no idea how he gets all that air in, but it sure is funny when it comes out! His are different pitches ranging from a trumpet sound to whistle and different tones sometimes sounding angry or cute.
I also understand what you mean about the loo at work. Although ours is not co-ed, it is in close proximity of everyone else and to make matters worse there is a vent in the door! Luckily, everyone knows about my having IBS and there is plenty of Lysol!