On fours

A really drunk dude stood up to leave a bar and fell flat on his face.
"Whoa, I need some fresh air" he thought and crawled outside.
He tried to stand up again, but fell face first into the mud.
"Screw it," he thought. "I'll just crawl home."
The next morning, his wife found him on the doorstep asleep.
"You went out drinking again, didn't you?" she said.
"Uh, yeah" he said sheepishly.
She shook her head and said "well, you left your wheelchair at the bar again."