That's too easy. How about a d20 with the numbers 1-5 on there 4 times? Or a d30 with them on there 6 times? Or a d100 with them oin there 20 times? Or is that just really silly?
My first d30 was defective and crushed on one corner, so it effectively only rolled 28 numbers with any reliability.
I actually got a lot more use out of it that way
My d100 didn't last long as a gaming accessory. It once rolled the entire way along a 6' long table, after which I swapped back to 2d10.
On the topic of weird dice , I have seen a d4 rolled that landed on its point (the tips on the pyramid were slightly flatter than normal). That freaked us all out a bit.
I'd have taken a picture of the d4. I have d4's and d10 that have small flat sides that it could land on, but I've never seen it done. Heck, it's hard to purposely balance it that way.