I've had a misfire or two in the past and sometimes, I'm hating that... Possibly i was shooting too fast for the system to recycle or the PW connection with its trusty sucky cables and sync ports were not 100% hitched up well...who knows.
I was shooting at high ISO's 800-1250 with a 2.0 or faster Aperture and using my Speedlights on 1/64 power with a ND filter to bring the power level down...dragging the shutter at 1/30 or 1/40th to bring in the ambient.
These first few frames were me working the scene, moving the flash around, shooting different shots for dramatic looks...
Not a happy accident...kinda got what I was wanting to get here...Flash 90 degrees from lens axis.

Same here...moved the flash from 90 degrees to about 45 to get this one...By the timing of this shot, I'm already feeling like a rockstar because the images are feeling very good to me, along with the quality of light.

Then, as his friends were all chiefing away on their stogies, one of them tells me that he wishes I was using a prettier background for photos...don't you love how guests always think they have a great idea for photos... Anyway, I kept shooting after telling him to "trust me" and my flash delivered again, giving me this shot of them together.

And finally, my happy accident appears... Among several frames where the flash actually fired, I got this one... I had no intentions of snapping a frame without light. Honestly, I kinda like it even more because the look of this shot and the smoke just does something for me :) 
Hope you find a few happy accidents coming soon!
mateo
Really unigue shots..I have enjoyed looking at your web-site and blog.
Mateo is the king when it comes to light night time scenes, ambient + flash he always rock the scene, love these images!
I like the 1st and 4th shots very much. I will have to try shooting with such low flash power, interesting!
How come I can never seem to get grooms to smoke cigars for me.?
I just came over from http://exhotgirl.blogspot.com/ because she mentioned your blog and found
your photos to be exciting and exquisite. I definitely am adding you
to my bookmarks..The second shot blew my mind..
Absolutely LOVE that first shot of the groom - killer ambient + off camera flash. Nice and moody. Sexy smoke helps too! Awesome.