Car Hit Tree

Its another day of long working day..... As a storeman waiting for the last trade to return their tools..... wait and wait and wait.... walk here walk there.... hungry somemore....
then finally the last trade is back... time check 2.15am.... not very late but very tired and shag...
after tools check and sign end of day, went to proceed to my car to return hm....
When i reach hm the carpark is almost full then managed to find 1 slot, when reversing i heard a loud 'Bang' sound..... never notice is a bike slot i hit the tree behind it... my car bumper nearly drop, lucky manage to push it back .... too shag already....