Aren’t you sick of that ugly irb prompt? Too much information.

$ irb
irb(main):001:0> "i dont care how deeply nested i yam".nil?   
=> false

Check it. Stick this in your .irbrc:

IRB.conf[:PROMPT_MODE] = :SIMPLE

Now we get a prompt which is, well, simple:

$ irb
>> !!nil
=> false

Less noise.