Checkout these excuses and see whether you have used them before or not?
http://msn.careerbuilder.com/Article/MSN-3633-Workplace-Issues-Theres-a-zebra-on-the-road-and-other-memorable-late-to-work-excuses/?SiteId=cbmsn43633&sc_extcmp=JS_3633_adviceMost memorable late excuses
If you're running late, it can be courteous to let your boss know. However, you may want to rehearse what you'll say before you actually say it. Whether it's real or not, if an excuse sounds too wild to be true, your boss is probably going to have a hard time being sympathetic.
Employers shared some of the most memorable excuses they've received from employees who were running late, including:
•Employee claimed a zebra was running down the highway and held up traffic (turned out to be true)
•Employee woke up on the front lawn of a house two blocks away from his home
•Employee's cat got stuck in the toilet
•Employee couldn't eat breakfast -- he ran out of milk for cereal and had to buy some before getting ready for work
•Employee was late to work because he fell asleep in the car when he got to work
•Employee accidentally put superglue in her eye instead of contact lens solution, and had to go to the emergency room
•Employee thought Halloween was a work holiday
•Employee said a hole in the roof caused rain to fall on the alarm clock and it didn't go off
•Employee was watching something on TV and really wanted to see the end
•Employee forgot that the company had changed locations
•Employee got a hairbrush stuck in her hair
•Employee was scared by a nightmare