Fortunately/Unfortunately

Unfortunately, squirrels don't have enough of an attention span to spy on people and relay information to the government reliably, so the government then invented jabberjays,

Fortunately, a lot of people were fans of The Hunger Games, so they didn't mind the government spying on them that way.

Unfortunately, the government now knows some... weird things about people, and the squirrels are not that fast.

Fortunately, the last surviving alien created a tea recipe that they then gave to the government to make them forget the weird knowledge!

Unfortunately, there was a government official who was in hiding who still remembered everything and proceeded to take over villainously.

Fortunately, I have my memory wipe gun.

Unfortunately, I completely forgot how it works, and it's basically useless to me.

Fortunately, I found the manual.

Unfortunately, I accidentally dropped the manual in a river.

Fortunately, I was able to chase it down the river and pull it out with a stick.

Unfortunately, the makers of the manual did not make it waterproof and the manual ripped apart as I held it.

Fortunately, I was able to contact the manufacturers of the memory wipe gun and ask for another copy of the manual.

Unfortunately, they got memory wiped.

Fortunately, there was a manual stuck in one of the manufacturer's boots.

Unfortunately, the sweat from his foot smudged a lot of the words, and it also made the manual smell really bad.