Cramer's lightning round: American Express is working with millennials

• It's that time again! "Mad Money" host Jim Cramer rings the lightning round bell, which means he's giving his answers to callers' stock questions at rapid speed.

American Express: "Oh, that quarter was beautiful. ... and they did it with millennials. Millennials are really signing up, 50% of the new cards. So that business is great."

Inseego: "I do not know Inseego. Wish I did."

Penumbra: "That thing is hot as a pistol. ... I have to do work."

Teledyne Technologies: "It's terrific. I've liked it for many, many years. ... It's a really good stock. I want to own it."

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