Easter egg: On the deleted scenes menu, highlight "play all" and press up. You will see visual development of Colin.
Easter egg: On the language menu, highlight English 5.1, hit left and click enter on your remote. You will see a hilarious parody of the THX logo and its Deep Note, featuring the robot Tex and Homer himself. At the end, a hilarious parody of the 5 Gum motto "Stimulate Your Senses", will say "Illuminate Your Senses."
Easter egg: Go to the trailers menu. Highlight play all and press up. You will then see visual development for the multi-eyed creature.
Answer: Homer has been known not to make the smartest decisions, and the decisions he does make, he makes without fully thinking them through. Clearly he wanted to get some donuts as quickly as possible without thinking of any other ways, so he decided to ditch the silo in the lake as it would be the fastest way of getting it off his back, even if it's not the smartest. Also, putting that aside, he likely wanted his own pick of the donuts rather than have Lenny guess what he wanted.
Casual Person