Today I gave a pneumovax injection in a patient's right arm with no issues. Then as i was giving her the flu vaccine in her left arm she said OUCH very loudly and then proceeded to ask if I had done it correctly or if it would even work now. I think she may have clenched the muscle as I was about to inject the vaccine. I usually push these pretty slowly and amuser I was in the deltoid muscle. Any other suggestions for better technique or other tricks to make people a little happier.