My dad did similar at My Grandads funeral.

we were behind the procession, and he had a great turnout which was nice. anyway. so the hearse is unloading the coffin and theres people crossing over to get to church and everything, basically the road is not moving for a few minutes.

BEEP BEEP BEEP BEEP BEEP BEEP. a f***ing taxi wanting to get through. my dad walked over, tried the door. it was locked. so in a weird, scarily calm sort of way held his finger to the window and said "stop bibbing your horn. theres a funeral going on are you fucking blind or what"

the taxi answered back....

He ended up bleeding i'll say that