We used to have a lot of off topic mirth on this forum, and I have spewed more than once laughing.
If you get that oil back far enough on your tongue to cause coughing, you are done for. I've been able to sneeze holding it in, but not when I have to cough.
The coughing usually only happens when I have some essential oils in the mix, or I have a heavy bitter oil in my mouth. It somehow gets way back there and gags me something fierce. When it starts, you just have to be somewhere to expel it pretty fast.
I used to pull and read on the computer and I noticed that there were many spots of oil on the monitor and other places where I started to giggle....I guess it's something that you have to be somber when doing, which for me, is counterintuitive.