“Thoughts and prayers” are usually for times of trouble. The fact you’re suggesting they could be “I’m getting a sandwich” is wildly selfish, and shows how horrid of a person you are.
Find god, he’s waiting for you.
Discussion
The joke is a word play on the word "thoughs", because "thoughts and prayers" is used commonly as a way to wish someone better without doing any action, but people often don't consider the word "thoughts" in the context of actual daily thoughts that one may have.