Does anyone know the punchline to these one liners?

[nprestidge]

I’ve got a gun made out of a dozen pigs….

I was going to write my will today but I thought…

My mums into role reversal. She…

The other day I couldn’t decide whether to buy a packet of guitar strings, or a box of eggs. It was…

I was going to buy some slippers today but then…

Sometimes I lie at the top of a grassy bank and then rotate my body through several revolutions until I’m at the bottom…

[NazNomad]

12 Boar (Bore?)

[lesblue]

2. I'd leave it.... or....I'd leave it to someone else??
6. I'm on a roll...or...I'm going downhill??
Any good??

[jackthehat]

4. It was six of one and half a dozen of the other.

[lindylou16]

A man complains to his wife saying

"We're so poor we cant even afford punchlines to our jokes!"

And she says.