Dough

The bakery I worked at got robbed. They demanded the dough; apparently, it couldn't be baked first.

Memory

I was born yesterday, and I walked down memory lane. I fell over the edge!

Age

I always feel better when my doctor says something is normal for my age, but then think dying will also be normal for my age at some point.

Vegetable

"Lettuce" stop making vegetable puns. We don't carrot all about them and they're not a-peas-ing.

Gas

I'd make a joke about Noble Gases, but I probably wouldn't get much of a reaction.