Ha! Allan, you’ve added a new definition to blunderbuss — all fitting this situation:

• short-barreled large-bored gun with a flared muzzle, used at short range (Don Jr’s elephant gun)
• an action or way of doing something regarded as lacking in subtlety and precision (Don Sr’s buffoonery)
• The vehicles used to put those who’ve blundered so badly out of their (and Don Sr’s) misery

Excellent!