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When invited to a party it’s always good manners to bring something.
A bottle of wine. (not poisoned)
A dessert dish. (not poisoned)
Some rat poison. (likely somewhat poisoned)
It depends in large part on the kind of household you visiting,
their customs and traditions, as well as their level of rat infestation.
One of those electric fly zappers that the flies fly into,
spark and catch on fire, and then you can smell the fly burning
may also be appropriate under certain circumstances.
For example, if they have an excessive number of flies
due to dead rats.
Sometimes it’s nice to provide your host with a dish such as a breakfast bread,
that they can enjoy the morning following the party when they are tired from a prior evening
Preferably, one in a rat-proof container that the rats won’t be able to gnaw through before your
friends can enjoy it.
If you are feeling in a romantic mood, which would be really weird as you are likely showing up to your friend’s house who is already married and you are probably there with your significant other as well, but nothing about you surprises me anymore.
You could bring some flowers or a plant.
One that might be poisonous to rats when gnawed upon.
Finally, the truly thoughtful guest will bring a leaf blower
to blow all the rats off the other guests and clear a path to the dinner table.