誕生日のライド

Zさん："誕生日おめでとう！"
Aさん：「ありがとうございます！ Glad you could make it, how was the drive over?」
Zさん："Couldn't tell you.  I took the bus."
Aさん：「Really...」
Zさん："You know, I honestly do enjoy riding on the bus.  It's great.  Put it this way... ハッピー、バスで"
Aさん：「。。。I really hope that pun wasn't my present.」