This picture of an adolescent lion cub yawning cracks me up. And given how tired I am right now, and how cranky I realized the tiredness had made me, it seemed to fit the mood.
(Actually, I am generally quite happy tonight, bursts of crankiness aside. My mother has come out for a visit from California, and I am looking forward to her company. I am also very appreciative of the help she is planning to give me with some of the overwhelming home projects that are leading to my cranky tiredness.)