A dictionary of Proverbs (Oxford Paperback Reference)

excites see the BLEATING of the kid excites the tiger.
excuse see a BAD excuse is better than none; IGNORANCE of the law is no excuse for breaking it.
He who EXCUSES, accuses himself
Cf. L. dum excusare credis, accusas, while you believe you excuse, you accuse; Fr. qui s’excuse, s’accuse.

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  1611 R. COTGRAVE Diet. French & English s.v. Excuser, Some when they mean to excuse, accuse, themselues. 1884 J. PAYN Canon’s Ward II. xxxi. It is very difficult for a person in my position to excuse without accusing himself, but I should like you to feel that Miss Gilbert’s fortune has formed no part of her attraction for me. 1936 J. STAGGE Murder gone to Earth vi. She spoke with such venom that I remembered the good old French proverb of ‘he who excuses, accuses himself.’ 1968 G. WAGNER Elegy for Corsica xi. The tests would be underground, every precaution taken, impossible to contaminate anything. One had heard these pleas before .. Who excuses himself accuses himself. ■ conscience; excuses
  

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What can you EXPECT from a pig but a grunt?
Used rhetorically with reference to coarse or boorish behaviour.
□1731 Poor Robin’s Almanack C6 If we petition a Hog, what can we expect but a grunt. 1827 SCOTT Journal 10 Apr. (1941) 41 They refuse a draught of £20, because, in mistake, it was £8 overdrawn. But what can be expected of a sow but a grumph? 1910 P. W. JOYCE English as We speak it in Ireland x. Of a coarse, ill-mannered man, who uses unmannerly language: ‘What could you expect from a pig but a grunt.’ 1997 Spectator 22 Nov. 37/2 References in Mr Cole’s letter to the ‘bottle’ were, to say the least, distasteful. But then, as they say, ‘What can you expect from a pig but a grunt?’ ■ conduct; human nature