Is it possible to help someone who takes everything very seriously to lighten up?

I’m taking about someone who has kind of a tough time rolling with the every day annoyances life dishes out; things like running late, missing a bus, being out of coffee. Someone who is driven to distraction by these kinds of things and can see an entire day derailed by stewing because breakfast was cold. Any suggestions as to how someone can help a person in this situation learn to take things in stride a bit more?