Hit my head on the ... (door, etc.)
Had car trouble
Hit another car
Heard an intruder
Hot coffee spilled in my lap
Hideous hair day
Chat with our AI personalities
Cramps are a reason for being late. They begin with the letter c.
Parent ill, plane delayed, Porsche would not start and procrastinated are reasons for being late. They begin with the letter p.
Alarm clock problem and ailing child are reasons for being late. They begin with the letter a.
Airport fogged in; had to reroute to Dallas.
a reason for being late starting with 'i' could be, "I was interuppted by..." an make up the rest of the sentence. or you could say "I was inexplicably unaware of the timing an hav many appologies of my absense."