gistfile1.txt

ruby-1.9.2-p180 :001 > bunny = bunny = { bunny => bunny }
 => {nil=>nil} 
ruby-1.9.2-p180 :002 > bunny = bunny = { bunny => bunny }
 => {{nil=>nil}=>{nil=>nil}} 
ruby-1.9.2-p180 :003 > bunny = bunny = { bunny => bunny }
 => {{{nil=>nil}=>{nil=>nil}}=>{{nil=>nil}=>{nil=>nil}}} 
ruby-1.9.2-p180 :004 > bunny = bunny = { bunny => bunny }
 => {{{{nil=>nil}=>{nil=>nil}}=>{{nil=>nil}=>{nil=>nil}}}=>{{{nil=>nil}=>{nil=>nil}}=>{{nil=>nil}=>{nil=>nil}}}} 
ruby-1.9.2-p180 :005 > bunny = bunny = { bunny => bunny }
 => {{{{{nil=>nil}=>{nil=>nil}}=>{{nil=>nil}=>{nil=>nil}}}=>{{{nil=>nil}=>{nil=>nil}}=>{{nil=>nil}=>{nil=>nil}}}}=>{{{{nil=>nil}=>{nil=>nil}}=>{{nil=>nil}=>{nil=>nil}}}=>{{{nil=>nil}=>{nil=>nil}}=>{{nil=>nil}=>{nil=>nil}}}}}