hard nut to crack

have a bone to pick

have one's hands full

thumb one's nose

have a skeleton in the closet

have a screw loose

to be slow to catch on

have a clear conscience

blind

have had enough

have had it up to here

to have the devil in one

have a mind like a sieve

talk out of turn

have a screw loose

have a screw loose

to have a bun in the oven

be well-oiled

have had a drop too much

have had one too many

have a sharp tongue

fool

let the cat out of the bag