this is way more than 10 but its good advice

if youre looking to buy a bike and any of these phrases are used in the ad, walk away:

only been down once.
works well when running.
runs like a champ!
carbs need cleaned.
baby on the way, wife says bike needs to go!
bent yoshi pipe.
easy fix, id fix it myself but im too lazy.
lost title, can get a new one printed.

theres more, im just lazy.. all of the above crack me up though.. haha