No Ants at a Picnic

Zさん："The other day I went on a picnic with my girlfriend. We went to a nice park and set up a blanket on the grass. It was good food and great company. Then out of nowhere, 10 ants climbed onto the blanket and headed for the food."
Aさん：「Oh no!」
Zさん："Right? But luckily an anteater showed up, and gobbled up the ants!" 
Aさん：「So what did you do?」
Zさん："What do you think? I said 蟻が十。"

普段

 Zさん："Here's a quick mnemonic device to remember the Japanese word 普段 (ふだん、hudan, which means 'usually'). In predictable, uncreative murder mystery stories, it is 'usually' obvious 'hudan' it."  

大雨

Bさん：「After the heavy rain storm, were you and your cat ok?」
Aさん：「I was fine. It was... あの... Sheba who got soaked.」
Cさん：「Why would ... a wet lawn matter?」
Bさん：「？」
Aさん：「？」 

Stinky Rhino

Dくん：「Hi Mr. Z!」
Zさん："Hey little man, how are you?"
Dくん：「Good! Wanna hear a funny joke?」
Zさん："Sure"
Dくん：「What do you say when a rhinoceros farts?」
Zさん："... I don't know ... what... "
Dくん：「サイオナラ！」
Zさん："... as fart jokes go, that's actually pretty good..." 

Eternity

Zさん："Hey. What's the Japanese word for 'eternity'?"
Aさん：「永遠。」
Zさん："... Fine... What's the Japanese word for 'an eternity'?