Oh yes. There are so many variables to consider before attempting to murder the insect in question. The angle of the strike, the amount of pressure applied, the speed in which you strike, the lighting, position of the insect, where it will fall, carrying utensils for the deceased, checking if it has family members that will avenge it's death.
This gets worse when it is a jumping spider.
Wait, a jumping spider? You aren't supposed to kill those cute little things.
No. I posted about this once in my blog once even... when bugs/spiders dare to venture into my lair, then they pay the consequences. I have no sympathy for these intruders. They should know the laws of nature!
"Charlotte sometimes dreams a wall around herself. But it's always with love - So much love it looks like everything else. Charlotte Sometimes - So far away, glass sealed and pretty." - The Cure
To be fair, it was difficult to find a creepy non-close-up of a Jumping Spider. They are pretty cute looking when you forget they're venomous little shits. I even said "aww" a few times; something I'm ashamed to admit.
Oh god, I feel that way too. Sometimes it takes so long for me to prepare to kill it that it just leaves.
One time in college I was living in an old house with a bunch of roommates. Me and the other INFP were left alone when we discovered that there was a giant spider on the ceiling. We argued for two hours over who should kill it (my argument was: dude, you're the boy! his was: fuck that!) and we concocted all sorts of various contraptions with brooms, etc. Finally our ENTP roomie came home, got a chair and smashed it with his hand. Then he chased me around the house trying to touch me with his spider gut hand.
I don't know what the point of that story was other than: he/she who hesitates, may find that their mission is carried out by somebody with no morals.