Who could've thought vs Who shou;d

Some examples from the web:

• Who could've thought?
• Who could've thought?
• I thought I was supposed to be the one who could hear thoughts.
• I just thought of who could help us make our meeting.
• I thought that you were the first person who could understand.
• I thought there might be somebody in steerage who could mend it.
• Thought I was the only one who could impersonate federal agents.
• Someone who could kill you without a second thought.
• I never knew anyone who could see someone's inner desires and thoughts quite like Jenny.
• I thought maybe one of you knew someone who could get me in.
• Somebody who could give me the life I thought I wanted.
• I thought we agreed we would hire someone who could actually help.
• I thought you were someone who could help lead us to peace.
• I thought it was you who could predict the future.
• I thought Peter was the only person who could protect me.
• They thought they were supermen who could get away with murder.
• Especially if transmitted by thought at a distance, who could learn about them. True, thought can be intercepted, but for this special conditions are necessary.
• You know, I thought I had found somebody who could make me happy.
• I thought I was a man who could make a woman happy.
• I've always thought you were a man who could keep up, Don.

Some examples from the web:

• Shou d we eat at Tak gawa?
• If she marr ages h m What shou d I ca h m?
• Shu shot her in the shou d and murdered her best friend, But she wanted you to forgive her?
• At noon on the seventh day of the first moon of the second year Yung-shou of the Han Emperor Heng (A. D. 157), Tao-ling ascended the Cloudy Mountain (Yun-shan) with his wife and two disciples, and with them disappeared into heaven.
• It shou d have been me...