Natural French phrase for 'you got a strange idea for fun'?

Question

The vocabulary needed seems simple enough but I'm struggling with composing a whole sentence. Is there a natural French phrase to say this kind of things half jestingly?

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(You wave at total strangers just to see how they would react?)

• You got a strange idea for fun!

Answer 1

The following suggestion is slightly off for it doesn’t directly call into question the level of strangeness of someone’s idea of fun, but rather how low they’ve set their “fun-bar” (i.e., how little it takes to amuse them), but it can, at least, be used to poke some good-natured fun at the activity and those who consider it to be fun:

Ça t’amuse vraiment ? Hé bien/Alors, il t'en faut {vraiment} peu {pour t’amuser/pour être heureux/euse} !

(follow the above link to a WordRefernce.com thread discussing "il t'en faut peu")

Answer 2

Aside from the already mentioned "Tu as de drôles de façons de t'amuser !", if you're going for something sarcastic:

Ah bon... C'est original, comme façon de s'amuser.

Answer 3

Good answers already :

• This one, lightly facetious
  _{Tu [en] as de drôles de façons de t’amuser !}
• ...and that one, a little more sarcastic
  _{Ah bon... C'est original, comme façon de s'amuser.}

To add more examples on the sarcastic side, I suggest :

• Ça amuse les enfants ! → common in the area of Quebec where I grew up, back in the nineties. It has remained to this day, but it’s somewhat less used now.
• On s’amuse comme on peut... → implies to a certain point that the silliness of the game is a consequence of a poor imagination.

Answer 4

If I understand correctly¹ what the English sentence means, that might be:

Tu [en] as de drôles de façons de t'amuser !

Or the colloquial:

T'es un peu chelou, toi !

¹_{I guess I did, Flying_whale had the very same sentence in mind too...}