She grabs the gun and holds

A young blonde fears her husband is having an affair.

She goes to a gun shop and buys a handgun.

The next day she finds him in bed with a redhead.

She grabs the gun and holds it to her own head.

The husband jumps off the bed and starts begging and pleading with her not to shoot herself.

Hysterically, the blonde responds to the husband: “Shut up, you’re next.”