Before performances, Jonathan has several rituals he runs through in order to calm his nerves. As he explained to Attitude magazine in October 2018, "They're f*cking nuts and get weirder throughout the run . . . like having to flick my watch five times, and once when I was doing a play at The National I got to the point where I felt I had to take half a paracetamol before every entrance. Then there was the time where I'd say a Hail Mary. I did go to a Roman Catholic school, but that was pure anxiety. If I didn't say it, I'd think something awful would happen."