25 

Is a start to finish blow job usually averaging about 25 minutes!
The reference 25 is derived from the key pad of a phone. 2 representing B and 5 representing J. 25 = BJ

The age at which one can finally rent a car in the United States without being charged enormous amounts of money and without having to sign thousands of papers for that matter.

So, a half-blind 70-year-old just got his license, rents a car a kills 5 people is more acceptable than a 24-year-old who has been driving for up to 10 years without an accident.

Lysergic Acid Diethylamide-25. LSD, acid

more funny than 24

The number used to describe a sex offender/child molester as these types of crimes start with the prefix 25 of the penal code. Sometimes referred to as deuce-five, a prison gang on the PC yard in prison.

A number funnier than 24.