The only one that comes to mind is when I was going to take the wife out for some fishing and the motor wouldnt start at the house.
Took it to my mechanic to fix it, he changed the plugs and gave me a pretty big bill since I could have done that myself.
Still kicking myself we decide to go anyway after stopping and getting some Ice and drinks which I left at home.
Get to the ramp and start to push it off the trailer, push, push, cuss and push some more. One of the guys in the audiance watching this reminds me that I still have the gunnal strap on. I pull up the ramp to remove the strap only to realize I also forgot to put the bildge plug in.
After getting the boat over and parking the truck I go to save face and thank the guy for pointing out the strap only to realize it was my mechanic who only 45 minutes earlier replaced the plugs for me.
Long story short it ended up a pretty nice day.