Aping the pain

Just happened a few minutes back. I can't understand why things like these keep happening to me. I sprained my back from working out in the morning and I've been limping all day. I walk up to the coffee room and this old lady who is limping (of old age) infront of me, thinks I am imitating her. She gives me this cold stare and frowns at me.

We were both walking really slow, took ages to cross each other...very uncomfortable I tell you!