Something I find very funny (and I might be alone, as usual ¬_¬) is overheard conversations. It always seems to be a single sound-bite, rather than an entire conversation.
Today's was between two women who look like they're around 25-30:
Woman 1: "So they said a little bit of meat might actually be good for, y'know...
women. So I was like, "Oooh! (

) Maybe I've been doing this all wrong?!"
I was standing behind them, holding a bread-roll with two sausages and two slices of bacon in it. ¬_¬
"Kingdoms and empires pass away like mist from the sea; the people shout and triumph and even in the revelry of Belshazzar's feast, the Medes break the gates of Babylon."
— Robert E. Howard, The Gates of Bal-Sagoth