@Jimmi Anger will more often than not come from build ups of stress. The obvious answer can be to find the cause of the stress, and nip it in the bud. Easier said than done sometimes, but it won't be the random strangers on the bus causing it. Deal with the bigger issue, and you'll find the what strangers do on buses to be insignificant.
On a note about pressing against backs of seats. I find as someone that is over 6ft, the leg room on a bus is often unsuitable for me. So I have to sit with my legs to the side, otherwise I'd end up with pins and needles, where the leg room is affecting circulation. For that reason though, I try and sit at the front, despite OAPs pointing out I haven't got a disability. I'll excuse their ignorance for thinking all disabilities are visible.
