Blessed bat pun: 蝙蝠→__福
The punch is 五蝠 →五福

A graphic of "five bats" (五蝠) symbolizes 五福臨門 (Five good fortunes come to the household)




Five good fortunes:
「壽(long life)、富(wealth)、貴(status)、安樂(peace)、子孫眾多(many children)。」