Woah instead of whoa. Drives me crazy.

Baited breath instead of bated breath. Bait is for fish! “Bated breath” refers to deliberately controlled breathing in a circumstance of high emotion, especially anticipation. (Think “abate.”)

Ball (round bouncy toy) when you mean bawl (cry vigorously), especially in the past tense. “Balled” is not a good image!

Hysterical when you mean hilarious. Hilarious means “really funny.” Hysterical means “out of control and panicked.” Laughter can be hysterical; a joke cannot.