I like catching birds doing things I don't normally see. So yawning photos, etc., are fine with me. But the Marsh Wren blooper is more like my bloopers. My most recent one is a shot of some branches in a tree where a Boreal Chickadee had been sitting prior to my shutter release. An older one is of a shrub where a White-eyed Vireo had been sitting prior to my shutter release. Despite waiting for some time, I never obtained another photographical view of these birds. I don't keep such images.
Another type of blooper is a lucky photo, one I wasn't expecting. When I first started taking bird images, I had no experience with which to judge an uncommon occurrence. If I saw something, I assumed I would see it again and get another opportunity. Well, it often didn't turn out that way. For example, while at Blackie Spit in 2009, I was watching a raptor which at the time I didn't recognize. It was a Peregrine Falcon, sitting not far from me. As I was lining up the photo, another raptor attacked it. Never since then have I seen a Northern Harrier attack a Peregrine. (Later the same day, I spotted the Harrier sitting on a snag and the Peregrine returned the favour.)
Older photos, saved in smaller size (I keep full size TIFFs in a large server.) I couldn't find these photos on my Flickr account, so posted them now to Flickr.
A good kind of blooper....