1。 trick or treat, smell my feet, give me something good to eat.
if you don’t, I don’t care, I’ll pull down your underwear (这句不好)。

可以google一下头两句看到一些其它唱法。

2。 Jingle Bells, Batman smells Robin laid an egg The Batmobile lost its wheel And the Joker got away
(铃儿响叮当的曲子)

还有许多，有空再上。