Is not a joke. The carrying of weapons (must bring your own) is often encouraged to enhance safety. When pushed to the limit, safety is not guranteed. Due compensation is usually rendered when one returns from an operation that may call safety into question. Undertaking a difficult task (such as time travel) with someone who has only done it once before is not safe, but highly encouraged.
"We're going to hunt sabretooth tigers, and safety is not guranteed. Better bring your own weapons."
"Wanted: Someone to go back in time with me. Safety not guranteed."
"Sean Connery knows nothing of safety, hes only done this once before."
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