Seems like I tell my kids this all the time (see title).
Was setting up for a sunrise shot one morning at the beach and noticed this guy by the water being perfectly still. Quickly changed lenses and got this one shot off before the seagulls came in. The heron I guess didn't like that too much, chased them away and then flew off. Didn't get a chance for a second attempt. Bummer I've got some motion blur on the bird, but I enjoyed the opportunity for the attempt.