It’s Speculation Friday on Mad Money, when Cramer recommends the riskiest, most dangerous stocks that also have the most potential upside. This week, the spotlight was on Tutogen Medical , a hugely speculative name but one with risk reward “too terrific to be ignored.”

Tutogen makes and sells materials used in soft tissue and bone repair. The stock is sitting about a dollar below its 52-week high of $12.27, which it reached after breaking out from the mid-$8 level on news of an expanded agreement with Zimmer Holdings , Cramer said. Zimmer happens to represent about 80% of TTG’s sales and owns about 32% of of its shares. Cramer thinks it’s likely that TTG gets a takeover bid from Zimmer. It already did last year, but TTG rejected the offer because the price was too low. Cramer thinks Zimmer will try again and pay up this time.