Ahh the old "boobytrap butty" has caught out many a man...I went to a local burger van and asked for The Breakfast in a Bun, the lass said 'do you want your egg yolks bursting'. 'Yep' I replied. 'Thought so' she said 'you don't look like you could be trusted with a runny yolk'. My wife nearly dropped her cup of tea and asked how the lass knew me so well?
It's right enough tho' I can get egg yolk down my front with a knife and fork let alone a filled roll.