Forgot Something

A guy goes in a bar and gets really drunk and starts to walk home. Every 2 steps he falls.

So he is 2 steps away from his doorway and he falls in. Then he tries to walk up the stairs quietly and get in bed.

In the morning his wife gets up before him and says "Were you drinking lastnight?"

He asks, "how did you know?"

She says "you left your wheelchair at the bar"