Sentence 1: Cal was drying off from his shower when he felt the urge to defecate. 
 Sentence 3: Cal got out a plunger and plunged until it was unclogged 
 Sentence 4:  In the process he became soiled from the water splashing 
 Sentence 5:  Cal had to take another shower and dry off with the wet towel 
 Option 1: When he went to flush the toilet he found it had clogged. 
 Option 2: Cal waited to the toilet bowl to fill up before he could flush.