Monyigote

What do you call an amoeba that crosses the road, jumps in a mud puddle and crosses the road again? A dirty double-crosser.

Two fish swim into a concrete wall. The one turns to the other and says DAM!

Two hydrogen atoms meet. One says "I've lost my electron." The other says "Are you sure?" The first replies "I'm positive."

What did the male bacteria say to the female bacteria? Who needs biology when we have chemistry!

Why did the bacteria cross the road? To prove he wasn't chicken.

What did one bacteria say to the other bacteria? Your gene pool could use a little chlorine.

What do you call a sewer expert? A connoissewer.