When he told the terrible joke, I only managed a weak ha ha and an awkward smile.

When he told the pun, I couldn't help going ha-ha, and everyone turned to look.

His nervous ha-ha broke the tense silence.

We ha-ha every time we remember that joke.

The landscaper suggested adding a ha-ha along the edge of the park to keep deer off the lawn without ruining the view.

The linguist noted that the villagers used ha's to mark the beginning of the harvest.

I ha a mind to leave ere dawn.

I ha' no coin to pay the ferryman.

I'll just have a ha' of that sandwich, thanks.

a-ha, so that's how the trick works!