The opposite of a mishap must surely be a hap. Here are a few recent haps and mishaps.
Hap: I have decided (more like been forced by my brother, ha) to update this here blog every tuesday.
Mishap: I waited until 10:30 this week.
Hap: Spring is here!
Mishap: Winter never came. It is like the world has had a fever and we were all enjoying it.
Hap: Keeping in touch with the West-coast Palkovitzenzes over Skype.
Mishap: Little miss had a ball-hop-mishap (mishop?) while video chatting.