Ok, how about I'm running late?
That's better... and something a former boss should have said at 11.00am when he was supposed to pick me up at 7.30am.
Boss: "I'm a little behind."
Me: "Little behind, big behind... either way you're still an arsehole for keeping me waiting." 
Yeah, the truck broke down (brand new starter motor went guts up) but he could still find a chuckle... a good boss, he was.