Title text:
'If you keep trying to spray your collaborators with the beam when they're not looking, I'm turning off the ion source and NO one will get to play with the beam!' --Physics's mom
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3257/
Hell, let's go American sizes... XXXL Hadron Collider!