Shelves are interesting things, I found that when I tried packing my bag for school, if I cut some bits, it would turn into a shelf. So I didn t cut things. I realized, that scissors were shelf making machines. I used this to my advantage, and made a factory of shelf making. it is called Furniture Galore™. So you see, all that is needed is a bit of common sense, and you can make a living off of you re accidents. But this doesn t answer the question.
All you need to do is analyse the situation. First, is anyone looking? if yes, chuck the shelf at them, and hope they die. then destroy the evidence. if no, then proceed to step 2.
Step 2: where are you? if you re outside, you can just chuck it in a river, and hope that someone will use it some day, to get across the river. if you re inside, just grab you re nearest M4A1, and blow the sh*t out of it. then proceed to step 3.
Step 3: Now that you have gotten rid of you re rage at making the shelf, put it in an atomic condenser. (you can just go to you re nearest AtomBOOM.co). this will allow you to extract the rage, and give it to an anime fan. This part will probably blow up the entire universe. (not Earth, because that is way too mainstream).
And hey presto, in only about 23 years, you have finally gotten rid of ONE of you re shelves. Repeat this process until you die, have fun ;)