When your best friend takes off his condom and turns it inside out for you to use.
My roommate knocked on my door and asked if I had an extra dong bag, I said regetably I was still wearing my last soldier. But as a good mate, I turned that shit inside out and saved the day with a Brophylactic!
When the use of a condom caused your penis to go limp because of their inhibiting and desensitizing nature.
Yo I was crushin this phat dime last week when all the sudden prophylactic shock set in. She told all her friends and now I can't even pay a girl to go out with me.