About your title: just wait until you're older. You might expect what's written in the photo and get something else entirely.
Can confirm. Got Legionaire's disease on my birthday. Getting older meant not being able to trust farts.
If the APU is on, there's a ton of hot air constantly blowing out of the very back of the plane. I.e. farting.
And that's why you need a secure and tight plug.
Always wear your plug