catch at straws (?.)

• ask for it
• be hopeful
• be rash
• be reckless
• carp
• cavil
• cut up
• fault-find
• find fault
• go too far
• keep hope alive
• keep hoping
• knock on wood
• never say die
• nitpick
• pettifog
• pick holes
• pick to pieces
• pull apart
• pull to pieces
• quibble
• take exception
• take heart
• tear apart
• tear to pieces