How'd you Know?

a guy sittin at the bar orders another drink.
'Sorry mate, you've had enough, time to go
home' says the barman. After swearing
abuse, the man finally decides to go home.
He attempts to stand up from his seat and
falls on the floor. He pulls himself up, takes
a step towards the door and falls flat on his
face again. Embarrassed, he crawls out the
door and along the road to his house. He
thinks to himself 'I better be quiet, don't
want to wake up the wife'. He puts his key
in the door as slowly and quietly as possibly,
the door swings open with an bang and he
lands flat on his face. He heaves himself up
the stair and into bed; looks over and his
wife is still asleep . 'Phew! i got away with
it!'.
The next morning he wakes up to find his
wife standing over him with a pint of water
and two paracetamol. 'How did you know i
was drunk last night?!' he exclaims.
You stupid f*cker, you left your wheelchair
at the pub again.