You came in late to work, and the boss was explaining how to do a project.
too many irons in the fire
You ran into someone you used to work with, but you forgot his name.
whatsername
Your boss asked you if you could stay late and clean up the office.
better late than never
You were chatting with your friend on the phone, but your mom started yelling "HELP!" from downstairs.
matter of life and death
Your friend asked you if you would help her shop for a gift, but you had an eye doctor appointment at that time.
tied up
Your brother said you took his 20 dollar bill, but you actually didn't - but you did see it on the washing machine.
blow the whistle on
You tripped and knocked your friend's soda off the table.
all thumbs
You just got to work, and you realize you forgot to bring an important paper that your boss needed today.
in one ear and out the other
Your friend asked if you liked her new haircut, and you really don't, but you don't want to hurt her feelings.
bad hair day
You see your boss in the hallway at work, and you really really need to talk to him, but he is talking to someone else right now.
come between
You are in the break room at work, and you notice your coworker is taking your lunch bag out of the refrigerator to eat it,
out to lunch
You want to take next Friday off of work so you can go on a trip with your family, but you the boss has a hard time finding someone to work on Fridays.
recharge your batteries
You see someone hit your coworker's car when he pulled out of the parking lot. Your coworker doesn't know about it.
give a heads up
Your coworker brought in cookies for her birthday treat, and you take one and it tastes terrible, like she forgot the sugar.
bad taste in my mouth
Your boss has a big glop of baby spit up on her back, and you notice it right before an important meeting.
egg on your face
Your boss asks you to do an extra job that you have no idea how to do.
wet behind the ears
