William took a shower on a cold afternoon in winter. Promptly after getting out of the shower he put his bathrobe on and walked outside to get the newspaper. The next night he felt achy and feverish. His wife told him it was because he went out in the cold with wet hair. This is an example of the fallacy.

Post hoc ergo propter hoc which is informal fallacy.

Explanation:

Post hoc ergo propter hoc which can be most time termed as pos hoc fallacy, is an informal type of fallacy, which determine conclusion based on the order of events occurrence alone, instead of considering other possible factors that might rule out the connection.

It is expressed as "Since A occurred, then B occurred. Therefore, A is the cause of B."

In other words, since the event B occurred after event A, event B was caused as a result of event A occurrence.

Another example is : The team always lose a match whenever they wear white jersey. Therefore, the white jersey causes the team to lose